Chain A ( L418 A419 A420 P421 L422 L423 K424 R425 L426 S427 L428 K432 L433 L436 I473 V478 I479 F480 E481 S482 R483 P484 D485 C486 Q489 V490 L493 E508 L554 I555 I556 P557 R558 G559 S560 S561 L563 V564 I567 Q568 A571 I574 P575 V576 G578 H579 S580 E581 G582 E607 Y608 A610 A611 C612 N613 E667 G669 S694 H695 T696 A717 C718 R726 F727 S728 D729 G730 Y731 R732 F733 L735 A737 E738 V739 G740 I741 S742 T743 S744 R745 I746 H747 A748 R749 G750 P751 V752 G753 L754 E755 G756 L757 L758 )