1. Skin Type I collagens were isolated from the five species of non-teleostean fish and examined with respect to their subunit chains. 2. In addition to alpha-1(I) and alpha-2(I) chains, a fish-specific chain, alpha-3(I), was previously found only in teleostean fish. The present study, however, has revealed the occurrence of alpha-3(I) in a chondrostean fish. white sturgeon. 3. The alpha-3(I)
... [Show full abstract] gene appears to have arisen from a duplication of the alpha-1(I) gene near the time of the adaptive radiation of bony fish.