Bone marrow (labels) - histology slide

*Polychromatophilic erythroblast: nucleus is more condensed than that of the proerythroblast; cytoplasm less blue, more grayish.

*Orthochromatophilic erythroblast: nucleus more condensed, smaller than that of previous cells and looks pyknotic by comparison; cytoplasm beginning to take on a more pinkish cast.

Histology image courtesy of OSU College of Veterinary Medicine. Copyright © Charlotte L. Ownby. Reprinted with permission.