Chain A ( E426 T453 K454 H457 L458 K461 E462 R465 S493 K497 F530 Y531 V534 Q539 M540 A541 L542 N543 A544 T545 Y546 I547 F548 N549 G550 L551 T552 V553 S554 V555 D575 M576 K577 S578 I579 P580 L581 A582 M583 A584 P585 F587 A604 P605 S606 R607 Q608 D609 I610 L627 F628 K629 S630 E632 V757 S758 D759 H760 I761 Q762 K763 V764 L765 K766 P767 N768 F769 A770 A771 A772 W773 E774 E775 V776 G806 M807 Q808 P809 C810 E811 R812 L827 A828 G829 I830 F831 R832 G833 G834 Y835 D836 L837 L838 R856 S857 K858 T861 P862 )