Chain A ( F17 I21 A24 N25 R26 E27 V28 L29 L30 C31 V32 L33 V34 F35 L36 S37 L38 G39 L40 V41 L42 S43 Y44 R45 C46 R47 G72 L73 F75 L295 V296 S297 N298 S391 F392 L393 P394 P395 S396 S397 V398 K399 D408 Y410 N411 M412 R413 V423 F448 K452 S453 F454 Y455 W456 A457 R458 K459 T460 S461 H462 S463 F464 V465 V466 N467 I468 L469 Q471 E475 P514 N515 P516 L517 V518 L519 I520 G521 F524 L554 Y555 K556 A557 C558 S559 V560 I561 F562 P563 L564 I565 Y566 S567 E568 M569 K570 Y571 M572 V573 H574 )