Chain A ( L22 F65 E81 G82 E84 M85 W86 N87 P88 N89 R90 W102 W117 A127 S128 S129 L130 D131 V132 Y133 D134 R136 F137 A434 T436 L437 S438 I451 E452 F453 I457 P458 D460 P461 S462 R463 Y465 )