Chain A ( S7 N8 R9 D10 F11 V12 E13 V24 L25 E26 H27 G28 S29 C30 V31 T32 M34 L45 G281 H282 L283 Q316 H317 G318 R350 E370 K393 I398 G399 Q400 M401 F402 E403 T404 T405 M406 R407 G408 A409 K410 R411 M412 A413 I414 L415 G416 D417 T418 A419 W420 F422 Y488 L489 M492 V493 Q494 A495 )