Although the erythrocytes of lizard are clearly different from those of mammals(persistence of the nucleus and of a residue of cytoplasmic basophilic substance), there is an analogy in their production: starting with a large pro-erythroblast, 4 successive mitoses reduce the nuclear size to 1/2, 1/41/8 and 1/16, allowing differentiation of 5 cell types. The passage from the marrow into the blood, however, is less selective than in mammals: in the blood of lizard one finds numerous cells that have not undergone all the mitoses and transform directly into larger erythrocytes with larger nuclei, than the majority of erythrocytes
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© 1973 S. Karger AG, Basel
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