Erythrocytes

Erythrocytes are Red Blood Cells (RBC). They have no nucleus (except in reptiles and avain species) and stain red because of the hemoglobin in them, which carries oxygen around in the body. Hemoglobin makes up about 90 pee Every single cell in this picture is a RBC, with the exception of the really small purple dot towards the center (which appears to be a platelet).