VAL 440 * ASP 441 * GLY 442 * ALA 443 * ALA 444 * ARG 446 * ASN 472 * GLN 473 * THR 475 * GLU 476 * LEU 477 * THR 495 * ASP 496 * SER 497 * GLN 498 * TYR 499 * ALA 500 * TRP 533 * VAL 534 * PRO 535 * ALA 536 * HIS 537 * LYS 538 * ASN 543 * GLU 544 * VAL 546 * ASP 547 * LYS 548 * VAL 550 * SER 551 *