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Content of Citrulline and Other Amino-Acids in a Protein of Hair Follicles


CITRULLINE has been shown to occur in the fibrous protein of the inner root sheaths of hair follicles1. This appears to be the first recorded occurrence of citrulline in an animal protein, although Smith and Young2 described its presence in the protein of the red alga, Chondrus crispus.

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  1. Rogers, G. E., Biochim. Biophys. Acta (in the press).

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ROGERS, G., SIMMONDS, D. Content of Citrulline and Other Amino-Acids in a Protein of Hair Follicles. Nature 182, 186–187 (1958).

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