CHAIN B  70V, 73T, 74N, 75G, 76T, 147N, 148K, 149S, 150W, 151M, 176D, 177L, 178E, 179G, 180K, 181Q, 182G, 183N, 212R, 244R, 245S, 246Y, 247L, 248T, 249P, 250G, 251D, 252S, 253S, 254S, 255G, 256W, 438N, 441S, 442K, 443V, 444G, 445G, 446N, 447Y, 454F, 456K, 457S, 458N, 460K, 467S, 476T, 492S, 494G, 495F, 496Q, 497P, 498T, 499N, 500G, 501V, 502G, 503Y, 554N, 556K, 558L, 559P, 676T, 677N, 678S, 679P, 680R, 701N, 702S, 703V, 714T, 791P, 792I, 807P, 808S, 810P, 912N, 915Y, 916E, 1069Q, 1109E, 1112I, 1116D, 1137D, 1138P, 1139L, 1140Q, 1141P, 1142E, 1143L, 1144D