Chain A ( K258 N261 F262 S263 D264 W265 Y266 T267 Q268 V269 I270 V271 K272 S273 E274 L275 I276 E277 Y278 Y279 D280 I281 S282 G283 C284 Y285 I286 L287 R288 P289 A290 A291 Y292 I294 E338 R357 P358 N386 T387 V388 V389 R390 W391 E392 F393 K394 Q395 P396 T397 P398 F399 I400 R401 T402 R403 E404 F405 L406 W407 Y435 K448 G451 E452 K453 T460 T462 A463 E464 A465 F466 I467 S468 E469 N470 G471 R472 A473 I474 Q475 A476 A477 T478 H480 C511 T512 T513 R514 S515 I516 G517 I518 M519 I520 M521 T522 H523 G524 L529 V530 R593 A648 K650 K651 L652 S655 K672 K690 T705 T706 L707 S708 G709 A710 K712 L714 G743 R744 S745 Y746 )