The aim of the work was to examine the morphology of the bone marrow of mice during stimulation with G-CSF. Experimental Balb C mice were daily injected subcutaneously with 250 μg/kg b.w. G-CSF (Neupogen). After 2, 4 and 6 days of the experiment femurs were obtained for morphological study. On day 2 of the mobilization the amount of haematopoietic cells in the bone marrow increased and dilatation of the sinusoids was observed. Only single leukocytes were observed in the lumen of the vessels. There were numerous leukocytes in the lumen of the sinusoids on day 4 of the mobilization. The morphology of the bone marrow on day 6 was similar to that of the control. Mobilization of mice with G-CSF resulted in migration of haematopoietic cells from the bone marrow and the process is most pronounced on day 4.
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