Abstract
Summary
Mice were made tolerant to rat red blood cells, by the injection of 250 mg/kg of cyclophosphamide. Such tolerant mice, made polycythemic by three transfusions of 1 ml of 50% rat RBC suspension, show a good response to erythropoietin injected 11 days after cyclophosphamide and may be used in the assay of erythropoietin.
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