广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Structure Fibroin protein polymer Pack well lots of h bonds small number of ionic bonds No cystine: no s-S bonds ■ Configuration: pleatedβ- sheet Degree of polymerization of silk dPsilk dpwoolStructure  Fibroin protein polymer ◼ Pack well: lots of H-bonds, small number of ionic bonds ◼ No cystine: no S-S bonds ◼ Configuration: pleated b-sheet ◼ Degree of polymerization of silk DPsilk > DPwool