In the course of study on the amino acid composition of sheep rumen Protozoa, a new ninhydrin-positive substance was isolated from acid hydrolysates of a proteolipid-like material of Protozoa. This substance was ideneified as 2-aminoethane phosphonic acid, and the occurrence of a C-P bond in Nature has been demonstrated for the first time.
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HORIGUCHI et al. (1960) studied this question.