Chain A ( A227 A228 R351 P352 L371 F373 S374 R378 E403 V404 L405 F406 T407 M408 C409 F410 I411 V414 T439 T524 I574 F575 R578 S626 L628 E629 L630 Y632 C633 Y635 E636 N656 L657 S658 T659 R660 M661 D662 H663 M664 V665 )