Erythroblastic islands of the bone marrow are morpho-functional units of erythropoiesis. The functional state of erythroblastic islands' cells of the bone marrow was for the first time defined by estimation of activity of the nuclear organisers of the central macrophages in the erythroblastic islands cultivated for 24 hrs in presence of various doses of the colony-stimulating macrophage factor. The findings indicate that increased doses of the colonystimulating macrophage factor was accompanied by a respective enhancement of the activity of nucleolar organisers in central macrophages of erythroblastic islands.
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