[Effect of thrombopenia on bone marrow CFU-S level and its capability to modify the circulating thrombocyte number]. 
Thrombocytopenia (rise of the thrombopoietin level) was induced by an antithrombocyte serum in mice.  After 6 hours of existence of thrombocytopenia, the CFU-S and megakaryocyte-commmitted stem cell content of the bone marrow and spleen was determined by transplantation into mice pretreated with 800 cGy-rtg irradiation.  Thrombocytopenia did not influence the CFU-S content.  Thrombocytopoiesis of the recipient mice was better restored by bone marrow and spleen cells of thrombocytopenic animals than by cells transplanted from animals with a normal thrombocyte count.