Chain A ( E301 P302 K304 Q323 I324 D325 S326 S327 D328 F329 L330 S331 T332 E333 E334 K335 E336 F337 L338 K339 K340 L341 S365 N366 P367 L368 K373 L376 K377 K378 L379 K380 L381 D382 I383 Q384 P385 D387 N389 Q390 R391 L392 Q393 D394 T395 G396 G397 L398 I399 S401 S403 I404 N405 R409 Y412 E439 N444 N445 L446 T447 A448 T449 S481 N482 N586 H588 N589 R628 F629 V630 F631 T632 D633 I634 T635 L636 P637 N638 I639 Q642 Y643 Q646 E648 I649 Y650 E651 Q652 V653 H654 S655 K656 G657 L658 Y659 V660 S665 I666 L667 L668 H669 G670 P671 S672 K673 G674 V675 E676 L677 R678 N679 D680 S681 E682 G683 F684 H686 E687 H690 S727 Y728 T731 N732 E735 )