scholarly journals Four tyrosine residues of the rice immune receptor XA21 are not required for interaction with the co-receptor OsSERK2 or resistance to Xanthomonas oryzae pv. oryzae

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e6074 ◽  
Author(s):  
Daniel F. Caddell ◽  
Tong Wei ◽  
Sweta Sharma ◽  
Man-Ho Oh ◽  
Chang-Jin Park ◽  
...  
Keyword(s):  
Tyrosine Phosphorylation ◽  
Kinase Domain ◽  
Xanthomonas Oryzae ◽  
Signaling Proteins ◽  
Tyrosine Residues ◽  
Catalytically Active ◽  
Important Regulator ◽  
Tyrosine Autophosphorylation

Tyrosine phosphorylation has emerged as an important regulator of plasma membrane-localized immune receptors activity. Here, we investigate the role of tyrosine phosphorylation in the regulation of rice XANTHOMONAS RESISTANCE 21 (XA21)-mediated immunity. We demonstrate that the juxtamembrane and kinase domain of Escherichia coli–expressed XA21 (XA21JK) autophosphorylates on tyrosine residues. Directed mutagenesis of four out of the nine tyrosine residues in XA21JK reduced autophosphorylation. These sites include Tyr698 in the juxtamembrane domain, and Tyr786, Tyr907, and Tyr909 in the kinase domain. Rice plants expressing XA21-GFP fusion proteins or proteins with these tyrosine residues individually mutated to phenylalanine (XA21YF-GFP), which prevents phosphorylation at these sites, maintain resistance to Xanthomonas oryzae pv. oryzae. In contrast, plants expressing phosphomimetic XA21 variants with tyrosine mutated to aspartate (XA21YD-GFP) were susceptible. In vitro purified XA21JKY698F, XA21JKY907F, and XA21JKY909F variants are catalytically active, whereas activity was not detected in XA21JKY768F and the four XA21JKYD variants. We previously demonstrated that interaction of XA21 with the co-receptor OsSERK2 is critical for biological function. Four of the XA21JKYF variants maintain interaction with OsSERK2 as well as the XA21 binding (XB) proteins XB3 and XB15 in yeast, suggesting that these four tyrosine residues are not required for their interaction. Taken together, these results suggest that XA21 is capable of tyrosine autophosphorylation, but the identified tyrosine residues are not required for activation of XA21-mediated immunity or interaction with predicted XA21 signaling proteins.

scholarly journals Mouse Receptor Interacting Protein 3 Does Not Contain a Caspase-Recruiting or a Death Domain but Induces Apoptosis and Activates NF-κB

1999 ◽  
Vol 19 (10) ◽  
pp. 6500-6508 ◽  
Author(s):  
Nanette J. Pazdernik ◽  
David B. Donner ◽  
Mark G. Goebl ◽  
Maureen A. Harrington
Keyword(s):  
Sequence Similarity ◽  
Kinase Domain ◽  
Dominant Negative ◽  
Dominant Negative Mutant ◽  
Death Domain ◽  
Interacting Protein ◽  
C Terminus ◽  
Catalytically Active ◽  
Induced Apoptosis

ABSTRACT The death domain-containing receptor superfamily and their respective downstream mediators control whether or not cells initiate apoptosis or activate NF-κB, events critical for proper immune system function. A screen for upstream activators of NF-κB identified a novel serine-threonine kinase capable of activating NF-κB and inducing apoptosis. Based upon domain organization and sequence similarity, this novel kinase, named mRIP3 (mouse receptor interacting protein 3), appears to be a new RIP family member. RIP, RIP2, and mRIP3 contain an N-terminal kinase domain that share 30 to 40% homology. In contrast to the C-terminal death domain found in RIP or the C-terminal caspase-recruiting domain found in RIP2, the C-terminal tail of mRIP3 contains neither motif and is unique. Despite this feature, overexpression of the mRIP3 C terminus is sufficient to induce apoptosis, suggesting that mRIP3 uses a novel mechanism to induce death. mRIP3 also induced NF-κB activity which was inhibited by overexpression of either dominant-negative NIK or dominant-negative TRAF2. In vitro kinase assays demonstrate that mRIP3 is catalytically active and has autophosphorylation site(s) in the C-terminal domain, but the mRIP3 catalytic activity is not required for mRIP3 induced apoptosis and NF-κB activation. Unlike RIP and RIP2, mRIP3 mRNA is expressed in a subset of adult tissues and is thus likely to be a tissue-specific regulator of apoptosis and NF-κB activity. While the lack of a dominant-negative mutant precludes linking mRIP3 to a known upstream regulator, characterizing the expression pattern and the in vitro functions of mRIP3 provides insight into the mechanism(s) by which cells modulate the balance between survival and death in a cell-type-specific manner.

scholarly journals Tyrosine phosphorylation of P-selectin in intact platelets and in a disulphide-linked complex with immunoprecipitated pp60c-src

1994 ◽  
Vol 299 (3) ◽  
pp. 613-621 ◽  
Author(s):  
P W Modderman ◽  
A E G K von dem Borne ◽  
A Sonnenberg
Keyword(s):  
Tyrosine Phosphorylation ◽  
Cell Activation ◽  
Secretory Granules ◽  
Protein S ◽  
Kinase Assay ◽  
Intact Cells ◽  
Tyrosine Residues ◽  
Reducing Conditions ◽  
Sds Page

P-selectin is a 140 kDa membrane glycoprotein found in secretory granules of platelets and endothelial cells where it is rapidly translocated to the plasma membrane upon cell activation. It then functions as a receptor for various types of leucocytes. Metabolic labelling of resting platelets with 32Pi showed that P-selectin is primarily phosphorylated on serine residues, although some tyrosine phosphorylation was observed as well. However, tyrosine phosphorylation of P-selectin was greatly stimulated by treatment with the permeating phosphatase inhibitor, pervanadate. When P-selectin immunoprecipitates were incubated with [gamma-32P]ATP (in vitro kinase assay), a fraction of P-selectin was phosphorylated on its tyrosine residues by a co-precipitated kinase. P-selectin phosphorylated in vitro co-migrated with 140 kDa surface-labelled 125I-P-selectin during SDS/PAGE under reducing conditions. Under non-reducing conditions, however, phosphorylated P-selectin was disulphide-linked to unknown protein(s) in a 205 kDa complex. In vitro kinase assays of the most abundant platelet tyrosine kinase, pp60c-src, demonstrated the presence of similar 140 and 205 kDa phosphorylated proteins in SDS/PAGE under reducing and non-reducing conditions respectively. Extraction and reprecipitation studies with proteins phosphorylated in vitro indicated that P-selectin and pp60c-src form a 205 kDa 1:1 disulphide-linked complex. In the complex, pp60c-src autophosphorylation is inhibited and P-selectin is phosphorylated on tyrosine residues. As protein disulphides in the cytoplasm of intact cells are extremely rare, our results suggest that P-selectin and pp60c-src, which co-localize in platelet dense granules, may be non-covalently associated and spontaneously form disulphide bridges during lysis. In addition, the observed tyrosine phosphorylation of P-selectin in intact platelets suggests that its function might be regulated by phosphorylation by pp60c-src.

scholarly journals Phosphorylation of the overlooked tyrosine 310 regulates the structure, aggregation, and microtubule- and lipid-binding properties of Tau

2020 ◽  
Vol 295 (23) ◽  
pp. 7905-7922 ◽  
Author(s):  
Nadine Ait-Bouziad ◽  
Anass Chiki ◽  
Galina Limorenko ◽  
Shifeng Xiao ◽  
David Eliezer ◽  
...  
Keyword(s):  
Lipid Binding ◽  
Binding Properties ◽  
Post Translational Modifications ◽  
Unique Role ◽  
Tyrosine Residues ◽  
Normal Functions ◽  
Tau Aggregation ◽  
Β Sheet

The microtubule-associated protein Tau is implicated in the pathogenesis of several neurodegenerative disorders, including Alzheimer's disease. Increasing evidence suggests that post-translational modifications play critical roles in regulating Tau's normal functions and its pathogenic properties in tauopathies. Very little is known about how phosphorylation of tyrosine residues influences the structure, aggregation, and microtubule- and lipid-binding properties of Tau. Here, we sought to determine the relative contributions of phosphorylation of one or several of the five tyrosine residues in Tau (Tyr-18, -29, -197, -310, and -394) to the regulation of its biophysical, aggregation, and functional properties. We used a combination of site-specific mutagenesis and in vitro phosphorylation by c-Abl kinase to generate Tau species phosphorylated at all five tyrosine residues, all tyrosine residues except Tyr-310 or Tyr-394 (pTau-Y310F and pTau-Y394F, respectively) and Tau phosphorylated only at Tyr-310 or Tyr-394 (4F/pTyr-310 or 4F/pTyr-394). We observed that phosphorylation of all five tyrosine residues, multiple N-terminal tyrosine residues (Tyr-18, -29, and -197), or specific phosphorylation only at residue Tyr-310 abolishes Tau aggregation and inhibits its microtubule- and lipid-binding properties. NMR experiments indicated that these effects are mediated by a local decrease in β-sheet propensity of Tau's PHF6 domain. Our findings underscore Tyr-310 phosphorylation has a unique role in the regulation of Tau aggregation, microtubule, and lipid interactions. These results also highlight the importance of conducting further studies to elucidate the role of Tyr-310 in the regulation of Tau's normal functions and pathogenic properties.

scholarly journals Lyn Physically Associates With the Erythropoietin Receptor and May Play a Role in Activation of the Stat5 Pathway

Blood ◽  
1998 ◽  
Vol 91 (10) ◽  
pp. 3734-3745 ◽  
Author(s):  
Hiroshi Chin ◽  
Ayako Arai ◽  
Hiroshi Wakao ◽  
Ryuichi Kamiyama ◽  
Nobuyuki Miyasaka ◽  
...  
Keyword(s):  
Tyrosine Kinase ◽  
Tyrosine Phosphorylation ◽  
Kinase Domain ◽  
Sh2 Domain ◽  
Erythropoietin Receptor ◽  
Tyrosine Kinase Domain ◽  
Binding Studies ◽  
In Vitro Binding ◽  
Vitro Binding

Abstract Protein tyrosine phosphorylation plays a crucial role in signaling from the receptor for erythropoietin (Epo), although the Epo receptor (EpoR) lacks the tyrosine kinase domain. We have previously shown that the Jak2 tyrosine kinase couples with the EpoR to transduce a growth signal. In the present study, we demonstrate that Lyn, a Src family tyrosine kinase, physically associates with the EpoR in Epo-dependent hematopoietic cell lines, 32D/EpoR-Wt and F36E. Coexpression experiments in COS7 cells further showed that Lyn induces tyrosine phosphorylation of the EpoR and that both LynA and LynB, alternatively spliced forms of Lyn, bind with the membrane-proximal 91-amino acid region of the EpoR cytoplasmic domain. In vitro binding studies using GST-Lyn fusion proteins further showed that the Src homology (SH)-2 domain of Lyn specifically binds with the tyrosine-phosphorylated EpoR in lysate from Epo-stimulated cells, whereas the tyrosine kinase domain of Lyn binds with the unphosphorylated EpoR. Far-Western blotting and synthetic phosphopeptide competition assays further indicated that the Lyn SH2 domain directly binds to the tyrosine-phosphorylated EpoR, most likely through its interaction with phosphorylated Y-464 or Y-479 in the carboxy-terminal region of the EpoR. In vitro binding studies also demonstrated that the Lyn SH2 domain directly binds to tyrosine-phosphorylated Jak2. In vitro reconstitution experiments in COS7 cells further showed that Lyn induces tyrosine phosphorylation of Stat5, mainly on Y-694, and activates the DNA-binding and transcription-activating abilities of Stat5. In agreement with this, Lyn enhanced the Stat5-dependent transcriptional activation when overexpressed in 32D/EpoR-Wt cells. In addition, Lyn was demonstrated to phosphorylate the EpoR and Stat5 on tyrosines in vitro. These results suggest that Lyn may play a role in activation of the Jak2/Stat5 and other signaling pathways by the EpoR.

Overexpression of a directed mutant of 14-3-3ω in Arabidopsis leaves affects phosphorylation and protein content of nitrate reductaseThis paper is one of a selection published in a Special Issue comprising papers presented at the 50th Annual Meeting of the Canadian Society of Plant Physiologists (CSPP) held at the University of Ottawa, Ontario, in June 2008.

Botany ◽  
2009 ◽  
Vol 87 (7) ◽  
pp. 691-701 ◽  
Author(s):  
Man-Ho Oh ◽  
Joan L. Huber ◽  
Wei Shen ◽  
Gurdeep S. Athwal ◽  
Xia Wu ◽  
...  
Keyword(s):  
Defense Responses ◽  
Cellular Proteins ◽  
Signaling Proteins ◽  
Glutathione S Transferase ◽  
Independent Manner ◽  
Client Proteins ◽  
The University

The 14-3-3 family of proteins are highly conserved signaling proteins in eukaryotes that bind to their client proteins, usually through specific phosphorylated target sequences. While the 14-3-3 proteins are thought to interact with a wide array of cellular proteins, there have been few studies addressing the in-vivo role of 14-3-3. As one approach to study this in-vivo role, we generated transgenic Arabidopsis plants constitutively overexpressing a directed mutant of 14-3-3 isoform ω that inhibits phosphorylated nitrate reductase (pNR) in a largely divalent-cation-independent manner in vitro. The transgenic plants had increased relative phosphorylation of NR at the regulatory Ser-534 site and decreased NR activity measured in the presence of 5 mmol·L–1 MgCl2 relative to nontransgenic plants. In addition, total NR protein was increased and the protein half-life was increased about two-fold. Two-dimensional difference gel electrophoresis analysis of proteins extracted from leaves of plants expressing the mutant 14-3-3 identified numerous cellular proteins that were altered in abundance. In particular, several β-glucosidase and glutathione S-transferase isoforms were decreased in abundance relative to wild type plants suggesting a possible alteration in stress or defense responses.

scholarly journals Bax signaling regulates palmitate-mediated apoptosis in C2C12 myotubes

2008 ◽  
Vol 295 (6) ◽  
pp. E1307-E1314 ◽  
Author(s):  
Jonathan M. Peterson ◽  
Yan Wang ◽  
Randall W. Bryner ◽  
David L. Williamson ◽  
Stephen E. Alway
Keyword(s):  
Insulin Resistance ◽  
Fold Increase ◽  
C2c12 Myotubes ◽  
Serum Starvation ◽  
Signaling Proteins ◽  
Induced Apoptosis ◽  
Apoptotic Effects

Insulin resistance is a primary characteristic of type 2 diabetes. Several lines of evidence suggest that accumulation of free fatty acids in skeletal muscle may at least in part contribute to insulin resistance and may be linked to mitochondrial dysfunction, leading to apoptosis. Palmitate treatment of several cell lines in vitro results in apoptosis and inhibits protein kinase B (Akt) activity in response to insulin. However, the role of Bax and Bcl-2 in regulating palmitate-induced apoptosis has not been well studied. Therefore, the purpose of this study was to determine whether palmitate-induced apoptosis in C2C12 myotubes is dependent on Bax to Bcl-2 binding. An additional purpose of this study was to determine whether the changes in Bax to Bcl-2 binding corresponded to decreases in Akt signaling in palmitate-treated myoblasts. Apoptotic signaling proteins were examined in C2C12 myotubes treated overnight with palmitate. Bax to Bcl-2 binding was determined through a coimmunoprecipitation assay that was performed in myotubes after 2 h of serum starvation, followed by 10 min of serum reintroduction. This experiment evaluated whether temporal Akt activity coincided with Bax to Bcl-2 binding. Last, the contribution of Bax to palmitate-induced apoptosis was determined by treatment with Bax siRNA. Palmitate treatment increased apoptosis in C2C12 myotubes as shown by a twofold increase in DNA fragmentation, an approximately fivefold increase in caspase-3 activity, and a 2.5-fold increase in caspase-9 activity. Palmitate treatment significantly reduced Akt protein expression and Akt activity. In addition, there was a fourfold reduction in Bax to Bcl-2 binding with palmitate treatment, which mirrored the reduction in AktSer473 phosphorylation. Furthermore, treatment of the C2C12 myotubes with Bax siRNA attenuated the apoptotic effects of palmitate treatment. These data show that palmitate induces Bax-mediated apoptosis in C2C12 myotubes and that this effect corresponds to reductions in AktSer473 phosphorylation.

β3 Tyrosine Phosphorylation in αIIbβ3 (Platelet Membrane GP IIb-IIIa) Outside-in Integrin Signaling

2001 ◽  
Vol 86 (07) ◽  
pp. 246-258 ◽  
Author(s):  
Lisa Nannizzi-Alaimo ◽  
K. S. Srinivasa Prasad ◽  
David Phillips
Keyword(s):  
Platelet Aggregation ◽  
Tyrosine Phosphorylation ◽  
Critical Role ◽  
Clot Retraction ◽  
Signaling Mechanism ◽  
Platelet Aggregate ◽  
Von Willebrand

SummaryThe platelet integrin αIIbβ3 not only binds fibrinogen and von Willebrand factor to mediate platelet aggregation and adhesion, it also serves as a signaling receptor. Platelet agonists such as ADP, thrombin and collagen induce “inside-out” signaling which activates the receptor function of αIIbβ3 for soluble fibrinogen. Subsequent platelet aggregation leads to “outside-in” signaling, inducing platelet aggregate stabilization and triggering a variety of functions important to platelet physiology. This review focuses on the role of β3 tyrosine phosphorylation in αIIbβ3 outside-in signaling. Tyrosine phosphorylation of β3 in platelets is a dynamic process which is initiated upon platelet aggregation and also by adhesion of platelets to immobilized fibrinogen. Tyrosine phosphorylation occurs on the β3 integrin cytoplasmic tyrosine (ICY) domain, a conserved motif found in thesubunits of several integrins. β3 ICY domain tyrosine phosphorylation induces the recruitment of two proteins to the cytoplasmic domains of αIIbβ3: the cytoskeletal protein myosin, important to clot retraction; and the signaling adapter protein Shc, important to platelet stimulation. The critical role of β3 tyrosine phosphorylation to platelet function was established by the diYF mouse, a novel strain which expresses an αIIbβ3 in which the two β3 ICY domain tyrosines have been mutated to phenylalanine. These mice are selectively impaired in outside-in αIIbβ3 signaling, with defective aggregation and clot-retraction responses in vitro, and an in vivo bleeding defect which is characterized by a pronounced tendency to rebleed. Taken together, the data suggest that the β3 tyrosine phosphorylation signaling mechanism is important to αIIbβ3 function and might be applicable to a wide variety of integrin-mediated events.

scholarly journals Src-dependent NM2A tyrosine-phosphorylation regulates actomyosin dynamics

2020 ◽  
Author(s):  
Cláudia Brito ◽  
Francisco S. Mesquita ◽  
Daniel S. Osório ◽  
Joana Pereira ◽  
Neil Billington ◽  
...  
Keyword(s):  
Tyrosine Phosphorylation ◽  
Cell Biology ◽  
Bacterial Infections ◽  
Focal Adhesions ◽  
The Status ◽  
Fine Control ◽  
Actomyosin Cytoskeleton

AbstractNon-muscle myosin 2A (NM2A) is a key cytoskeletal enzyme that along with actin assembles into actomyosin filaments inside cells. NM2A is fundamental in cellular processes requiring force generation such as cell adhesion, motility and cell division, and plays important functions in different stages of development and during the progression of viral and bacterial infections. We previously identified at the motor domain of the NM2A, a novel Src-dependent tyrosine phosphorylation on residue 158 (pTyr158), which is promoted by Listeria monocytogenes infection. Despite the central role of NM2A in several cell biology processes, the pTyr at this specific residue had never been reported. Here we showed that LLO, a toxin secreted by Listeria, is sufficient to trigger NM2A pTyr158 by activating Src, which coordinates actomyosin remodeling. We further addressed the role of NM2A pTyr158 on the organization and dynamics of the actomyosin cytoskeleton and found that by controlling the activation of the NM2A, the status of the pTyr158 alters cytoskeletal organization, dynamics of focal adhesions and cell motility, without affecting NM2A enzymatic activity in vitro. Ultimately, by using Caenorhabditis elegans as a model to assess the role of this pTyr158in vivo, we found that the status of the pTyr158 has implications in gonad function and is required for organism survival under stress conditions. We conclude that the fine control of the NM2A pTyr158 is required for cell cytoskeletal remodeling and dynamics, and we propose Src-dependent NM2A pTyr158 as a novel layer of regulation of the actomyosin cytoskeleton.

scholarly journals Notch Signaling Regulates MMP-13 Expression via Runx2 in Chondrocytes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Di Xiao ◽  
Ruiye Bi ◽  
Xianwen Liu ◽  
Jie Mei ◽  
Nan Jiang ◽  
...  
Keyword(s):  
Notch Signaling ◽  
Chondrocyte Proliferation ◽  
Runx2 Expression ◽  
Over Expression ◽  
Proliferation And Differentiation ◽  
Important Regulator ◽  
Signaling Activation

Abstract Notch signaling is involved in the early onset of osteoarthritis. The aim of this study was to investigate the role of Notch signaling changes during proliferation and differentiation of chondrocyte, and to testify the mechanism of MMP-13 regulation by Notch and Runx2 expression changes during osteoarthritis. In this study, Chondrocytes were isolated from rat knee cartilages. Notch signaling was activated/inhibited by Jagged-1/DAPT. Proliferative capacity of Chondrocytes was analyzed by CCK-8 staining and EdU labeling. ColX, Runx2 and MMP-13 expressions were analyzed as cell differentiation makers. Then, Runx2 gene expression was interfered using lentivirus transfection (RNAi) and was over-expressed by plasmids transfected siRNA in chondrocytes, and MMP-13 expression was analyzed after Jagged-1/DAPT treatment. In vivo, an intra-articular injection of shRunx2 lentivirus followed with Jagged1/DAPT treatments was performed in rats. MMP-13 expression in articular cartilage was detected by immunohistochemistry. Finally, MMP-13 expression changes were analyzed in chondrocytes under IL-1β stimulation. Our findings showed that, CCK-8 staining and EdU labeling revealed suppression of cell proliferation by Notch signaling activation after Jagged-1 treatment in chondrocytes. Promoted differentiation was also observed, characterized by increased expressions of Col X, MMP-13 and Runx2. Meanwhile, Sox9, aggrecan and Col II expressions were down-regulated. The opposite results were observed in Notch signaling inhibited cells by DAPT treatment. In addition, Runx2 RNAi significantly attenuated the ‘regulatory sensitivity’ of Notch signaling on MMP-13 expression both in vitro and in vivo. However, we found there wasn’t significant changes of this ‘regulatory sensitivity’ of Notch signaling after Runx2 over-expression. Under IL-1β circumstance, MMP-13 expression could be reduced by both DAPT treatment and Runx2 RNAi, while Runx2 interference also attenuated the ‘regulatory sensitivity’ of Notch in MMP-13 under IL-1β stimulation. In conclusion, Notch signaling is an important regulator on rat chondrocyte proliferation and differentiation, and this regulatory effect was partially mediated by proper Runx2 expression under both normal and IL-1β circumstances. In the meanwhile, DAPT treatment could effectively suppress expression of MMP-13 stimulated by IL-1 β.

Tyrosine phosphorylations in vivo associated with v-fms transformation

1988 ◽  
Vol 8 (1) ◽  
pp. 176-185
Author(s):  
D K Morrison ◽  
P J Browning ◽  
M F White ◽  
T M Roberts
Keyword(s):  
Tyrosine Phosphorylation ◽  
Kinase Activity ◽  
Cellular Proteins ◽  
Transformed Cells ◽  
Tyrosine Kinase Activity ◽  
Tyrosine Residues ◽  
High Affinity ◽  
Transformed Cell Lines

The role of tyrosine-specific phosphorylation in v-fms-mediated transformation was examined by immunoblotting techniques together with a high-affinity antibody that is specific for phosphotyrosine. This antiphosphotyrosine antibody detected phosphorylated tyrosine residues on the gp140v-fms molecule, but not gP180v-fms or gp120v-fms, in v-fms-transformed cells. This antibody also identified a number of cellular proteins that were either newly phosphorylated on tyrosine residues or showed enhanced phosphorylation on tyrosine residues as a result of v-fms transformation. However, the substrates of the v-fms-induced tyrosine kinase activity were not the characterized pp60v-src substrates. The phosphorylation of some of these cellular proteins and of the gp140fms molecule was found to correlate with the ability of v-fms/c-fms hybrids to transform cells. In addition, immunoblotting with the phosphotyrosine antibody allowed a comparison to be made of the substrates phosphorylated on tyrosine residues in various transformed cell lines. This study indicates that the pattern of tyrosine phosphorylation in v-fms-transformed cells is strikingly similar to that in v-sis-transformed cells.

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