of a soluble collagenous-type protein from the skin of various animals using dilute citrate buffers, which they suggested as a soluble precursor of collagen (Plotnikova, 1947; Tustanovskii, 1947; Orekhovich et al. 1948; Chernikov, 1949; Orekhovich, 1950, 1952). Such findings on soluble collagens were further reviewed by Harkness et al. (1954), who also reported the presence of a small amount of a protein of collagen type which was extracted from skin by dilute phosphate, pH 9-0 (alkali-soluble collagen)…
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