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Morphological composition of the bone marrow, content of hemopoietic precursors, intensity of their proliferation and differentiation, and the size of mesenchymal precursor pool were studied in experiments on CBA/CaLac mice with myelosuppression induced by adriamycin, cyclophosphamide, or 5-fluorouracil in the maximum tolerated doses. The dynamics of changes in the content of granulomonocyte precursors in the bone marrow after cytostatic treatment was similar to that of erythroid precursors. Changes in the content of stromal mechanocytes were specific for each cytostatic. Different character of the reaction of the hemopoietic and mesenchymal stem cells to the test cytostatics was demonstrated.

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