Abstract
Summary
The presence of iron-59 in the earliest stages of the erythroid series of the rat bone marrow was demonstrated by means of stripping film autoradiography after intraperitoneal injection of labeled ferric chlorides. Proerythroblasts and basophilic erythroblasts take up a detectable amount of radioiron after 3 to 6 hours. The maximum uptake, however, occurs in the polychromatic and orthochro-matic stages.
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