Abstract
Summary
1. Plasma of normal adult female rats contains a factor capable of stimulating erythropoiesis in hypophysectomized and newborn rats, as judged by increased circulating red cell volume and hemoglobin. 2. This humoral erythropoietic factor is markedly increased during pregnancy. 3. Injections of plasma from non-pregnant and pregnant rats resulted in an increase in plasma and blood volumes of hypophysectomized and newborn recipients.
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