Chain A ( S579 L580 F581 D582 G583 I584 A585 S604 E605 V606 C607 S610 V628 R629 G647 G648 S649 P650 C651 N652 D653 L654 S655 N656 V657 N658 R661 G667 T668 G669 L671 F696 E697 N698 V699 V700 A701 M702 H730 R731 A732 R733 Y734 T773 I774 T775 T776 K777 F809 K828 L829 L830 G831 R832 S833 W834 )