Letter to the Editor

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Neurath H. Hill R.L .: The Proteins, Third Edition, Boeder, C. (Ed.). Academic Press N.Y. , 1976.

Goodman I. : Bivalent sulfur in the preservation of life. University of Kansas Science Bulletin 46, 1–19, 1966.

Goodman I. Hiatt R.B .: Chemical factors affecting spontaneous motility of the small intestine of the rat. Biochem. Pharmacol. 13, 871–879, 1964.