Status of thromboplastin, antiheparin and antithrombin characteristics of the native and cryopreserved bone marrow was studied experimentally on 12 rabbits. It is found that both the native and cryopreserved bone marrow possesses a pronounced and dilution resistant thromboplastin activity, whereas antithrombin and heparin activities were statistically unauthentic. In that connection the bone marrow injected into blood circulation may have different effects depending on the initial state of the recipient blood coagulation. The fact should be taken into account in clinics.
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