Erythroblasts (bone marrow, rabbit)

Electron microscopy. (1) shows basophilic erythroblasts or early normoblasts with clumped heterochromatin in the nucleus and numerous polysomes. (1m) points to a mitotic figure of a basophilic erythroblast. A late polychromatic erythroblast or intermediate normoblast (2) marks a maturing stage in which the hemoglobin synthesis starts and the cytoplasm is more electron-dense. There is a decrease in amount of all organelles and nuclear clumping starts to take place. (3) young myelocytes. (C) capillary; (R) part of a reticular cell.