Chain A ( K367 I370 V410 V413 L417 L420 A421 L422 I423 Y424 W425 F426 M436 K442 F443 V444 A445 H446 A447 A448 S449 F450 T451 I452 F453 L454 W501 G504 M505 W507 A508 E509 C510 K511 E512 I513 W514 T515 Q516 G517 K519 E520 Y521 F523 E524 W526 N527 D530 R609 Y612 I613 K748 L749 W750 F751 S752 Y753 E755 E756 G757 R758 T759 L760 P761 V762 P763 F764 N765 L766 V767 P768 S769 P770 K771 S772 L773 L776 K779 )