A single injection of cysteine (950 mg. per Kg., I.V.) 5 minutes before total-body exposure of rats to x-rays (800 r) significantly modified the radiation-induced hematologic changes. Depression of the heterophils, lymphocytes, and erythrocytes was less severe and recovery more rapid. The hematologic observations are consistent with the thesis that cysteine reduces the biological effectiveness of the radiation.

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