Erythron in bone marrow smear (human)

Stain: May-Grnwald-Giemsa (MGG). The erythron or erythroblastic island consists of a large reticulum cell (1) surrounded by erythroblastic cell types (2) at varoius stages of differentiation. The nucleus of the reticulum cell (histiocyte) usually contains a noticeable nucleolus. At distance, some myeloid cell types (3) are spread