Chain A ( S127 I128 Q129 V130 R131 Q132 L271 S326 N331 P352 G353 T354 T355 V371 D372 A373 Y374 G375 K376 I377 R378 S379 K380 V381 E382 L383 E384 N397 A398 T399 C400 L401 N402 N403 E404 V405 I406 P407 L409 K410 S411 C412 M413 G414 L415 K416 I417 G418 D419 T420 V421 S422 F423 S424 K443 P444 V445 G446 F447 C593 M594 S595 S596 N597 G598 L599 L600 C601 T623 L651 N655 T656 C657 N658 R659 Y660 C661 R662 D663 E697 D698 S700 G701 K702 S703 )