Chain A ( L587 L593 F650 G652 P654 R662 Q663 F666 Q715 W722 E731 V732 N733 S735 I741 L742 E743 C744 E745 E746 S748 I749 L750 A751 F752 G753 T754 M755 L756 G757 Y758 I759 A760 Y791 W795 F798 I799 Y802 A803 T804 T805 F806 G807 K808 Y809 V810 P811 A812 V813 E814 V817 )