米 Structure Fibroin protein polymer a chain of amino acids forming a protein called fibroin composed of 15-18 different amino acids Glycine, alanine and serine occupy 86% of the polymer The side groups of the above 3 amino acids are small compared with those in wool glycine:R=H alanine: R=-CH3 Serine: r=-ChbOH Crystallize readily: 70-75%/Structure Fibroin protein polymer A chain of amino acids forming a protein called fibroin composed of 15-18 different amino acids. Glycine, alanine and serine occupy 86% of the polymer The side groups of the above 3 amino acids are small compared with those in wool: glycine: R = H alanine: R = -CH3 Serine: R = -CH2OH Crystallize readily: 70-75%