Recent innovations in microscopy and digital image processing have greatly enhanced the power of biological imaging. Basic principles of several new methods in light and electron microscopy will be discussed, and examples presented of their application to cell and molecular biology.
Extracellular hemoglobins of annelids consist of 12 subunits with appearance of superposed hexagons. So far, electron microscopy using negative staining techniques indicated that only the hemoglobins of Nephtys and Oenone contain an additional central subunit.
