Chain A ( Q432 E433 T434 L435 Q436 N437 L438 Q439 L440 Q441 A442 I449 I451 T453 T455 S463 W464 Q465 T466 L467 Q468 L469 Q470 N471 L472 Q473 V474 Q475 N476 P477 Q478 A479 T481 I482 T483 L484 A485 A513 G514 T515 V516 T517 V518 N519 A520 A521 Q522 L523 S524 S525 M526 L529 I532 N533 L534 S535 A536 L537 G538 S540 G541 I542 Q543 V544 H545 I547 N556 )