Abstract
Summary
The erythropoietic stimulating principle present in the filtrate of plasma obtained from anemic rabbits was partially purified by ethanol fractionation. This material was active in increasing Fe50 intake of normal rats and in producing a reticulocytosis and hematocrit elevation in repeatedly injected normal rats. Fe50 uptake was stimulated by as little as 0.08 mg of the fraction representing a concentration of 3,000 fold over that occurring in the plasma.
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