Chain R ( E404 F405 P407 M463 Y466 L467 I470 S505 E506 V509 S561 K565 V566 S567 I568 C569 L570 P571 M572 D573 T574 E575 Y582 I583 V586 L587 N590 F594 D633 F634 I635 C636 M637 A638 P639 I640 S641 F642 Y643 A644 L645 S646 A647 I648 N650 P652 I654 T655 V656 S657 N658 S659 K660 I661 L662 L663 V664 L665 F666 Y667 P668 L669 N670 S671 C672 )