Chain A ( L718 G719 S720 G721 A722 F723 G724 T725 V726 Y727 K728 A743 I744 K745 E746 L747 R748 E749 E758 I759 L760 D761 E762 A763 Y764 V765 M766 A767 S768 V769 D770 N771 P772 H773 V774 C775 R776 L777 I780 T785 V786 Q787 L788 T790 Q791 L792 M793 P794 G796 C797 L798 L799 D800 R803 Q820 I821 A822 G824 M825 L828 L833 V834 H835 R836 D837 L838 A839 A840 R841 N842 V843 L844 V845 K846 K852 I853 T854 D855 F856 G857 L858 A859 V876 P877 W880 Y891 S895 D896 V897 S899 Y900 G901 V902 T903 E906 F961 )