Fig. 6.

Erythroblasts are located in different areas of the subepicardium. Electron microscopic images demonstrating the location of erythroblasts inside blood islands (E) (a, b) and erythrocytes outside blood islands (E2) (a). Migratory activity of an erythroblast (E1) from a blood island into the subepicardial space is depicted in panel b. A phagocytozing cell (P) that contains remnants of erythroblast (e) cytoplasm and/or nuclei is present in the subepicardium (c). Black arrows point to endothelial cells of blood islands, and Ep indicates the epicardial lining