Abstract
Summary
1. Two samples of histone isolated from bovine thymus nuclei have been analyzed for their content of 18 amino acids by microbiological methods. Approximately 98% of the total N of the protein was accounted for by 16 amino acids. 2. Xo tryptophan was found in the thymus nucleohistone samples. 3. The presence of methionine in these proteins was confirmed but that of cystine is questionable. 4. In general, the amino acid composition of the thymus nucleohistone resembles that of the corresponding protein derived from chick erythrocyte previously reported by us.
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