88. Collagen is the most abundant protein with over 28 distinct types in the animal world. What are the three necessary amino acids that exist in the mature collagens? (A) Methionine, cysteine, glycine (B) Alanine, glutamate, arginine (C) Glycine, proline, lysine (D) Methionine, phenylalanine, cysteine (E) Serine, glycine, cysteine