Chain A ( D133 E135 V136 F348 H349 G350 N351 E352 R386 M387 A388 R389 L390 C391 W420 A421 N422 L423 M424 F426 D427 K433 L439 Y440 W442 P455 T456 G457 T458 V459 R460 S461 N462 L583 D584 F585 F587 P588 D589 C590 Q614 L615 V616 Q617 V618 L619 K620 Y621 E622 S623 Y624 L625 L629 L651 E654 M655 H656 V657 P658 S659 V660 A661 L662 R663 F664 G665 A979 L980 M981 R982 A983 A984 G985 )