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1. Salt-soluble rat skin collagen was precipitated from solution at neutral pH and 37 degrees . On cooling, a portion of the collagen returned into solution. The fractions were separated, the supernatant was concentrated and the precipitate was redissolved in dilute acetic acid. 2. Solutions of supernatant and precipitate were subjected to the same fractionation procedure, giving four fractions. 3. Each fraction was examined by starch-gel electrophoresis and a relationship between subunit composition and the fractionation procedure was noted. The collagen that redissolved on cooling contained less of the more highly cross-linked components than did either the fraction remaining in the precipitate or the starting material.

The relationship between reversibility of fibril formation and subunit composition of rat skin collagen