Biochemistry General 58b528d6 Amino-acid expressed maximally in collagen? A Tyrosine & phenylalanine B Alanine & aspaic acid C Glycine & cysteine D Proline & hydroxyproline High-Yield Explanation Ans. is `d' i.e., Proline & hydroxyprolineGlycine (33%), proline (10%), hydroxyproline, lysine and hydroxylysine are the predominant amino acids in collagen. Collagen.