Involvement of cholecystokinin in the opioid tolerance induced by dipyrone (metamizol) microinjections into the periaqueductal gray matter of rats

Pain ◽  
2004 ◽  
Vol 112 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Victor Tortorici ◽  
Lourdes Nogueira ◽  
Yexica Aponte ◽  
Horacio Vanegas
1995 ◽  
Vol 189 (2) ◽  
pp. 93-96 ◽  
Author(s):  
M.L. Schmitt ◽  
W. Coelho ◽  
A.S. Lopes-de-Souza ◽  
F.S. Guimarães ◽  
A.P. Carobrez

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