Bone marrow (labels) - histology slide

*Reticulocyte: no nucleus; cytoplasm still stains somewhat bluish due to
presence of remnants of polyribosomes

*Erythrocyte: mature erythrocyte has no nucleus (in mammals); cytoplasm stains very pink due to lack of ribosomes and presence of high amounts of protein, i.e., hemoglobin.

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