The most common motifs in the amino acid sequence of collagen are glycine-proline-X and glycine-X-hydroxyproline, where X is any amino acid other than glycine, proline or hydroxyproline. The average amino acid composition for fish and mammal skin is given. read more
Hydroxyproline is an important component of the collagen triple helix, and lower levels have been associated with joint degradation and therefore symptoms/signs of aging. Hydroxyproline is needed for collagen stability and is created by modifying normal proline amino acids after the collagen chain is built. read more