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Radioprotective and Radiosensitizing Effects of Sulfur-Containing Amino Acid Derivatives on Mice

Both protection and sensitization of Mice C57BL against 60Co γ-rays by sulfur-containing amino acid derivatives - S-alkyl-L-cysteines, S-alkyl-2-methyl-DL-cysteines and their hydantoin derivatives, and sulfoxides of these compounds - were examined. DL-5-Allylthiomethyl-5-methylhydantoin (150 mg/kg body weight) had a remarkable radioprotective effect. The survival ratio was 4.33 or above two times as much as that of L-cysteine. On the other hand, its sulfoxide had a radiosensitizing effects; survival ratio, 0.333.