複選題14. Which one of following features is the characteristic of class II MHC molecule? (A) Accommodates peptides of 10-30 residues (B) CD4 binds mainly to the o1 domain (C) Locations of polymorpbic residues are a1 and o2 domains (D) Nomenclatures are HLA-A, -B, -C in human (E) Polypeptide chains are a and Bz-microglobulin.