Chain A ( E420 P421 D422 I424 I428 I466 I500 R521 I522 S523 H524 V525 S547 F548 M549 F550 N551 G552 T553 S554 F555 G556 F557 G586 D587 R588 Q589 L590 N591 A592 F593 D594 I595 S596 L597 R598 F599 T600 H601 L602 F603 L693 W694 K695 S696 Y697 P698 E699 T700 H701 I702 V727 G728 V729 T730 S731 Q732 F733 Q745 A746 Y747 I748 E749 F750 I767 E768 F769 Y770 S771 T772 C773 L774 E775 E776 Y777 K778 P804 T805 L806 K807 P808 I809 L810 A811 D812 I813 E814 Y815 L816 Q817 D818 Q819 H820 L821 L822 L823 T824 S833 E836 C837 V838 V839 A840 L841 K842 S843 M844 I845 M870 K871 V872 R882 E883 R884 Y886 E887 Y986 )