Chain A ( S145 A146 R152 L153 A154 G155 R156 F157 E158 G159 G160 A161 E162 G163 R164 A165 Q166 D167 A168 D169 A170 W343 E344 L345 P346 L347 E350 Y353 T394 R417 M418 E420 S421 L422 F423 E424 V425 V426 T427 S428 F475 L479 R482 D491 L492 C493 D494 V495 V496 H497 A498 H499 A500 V501 G502 F504 V508 V511 P556 F557 Q558 R559 I560 T561 R562 L563 R564 M565 L566 L567 Q568 N569 I570 L571 R572 Q573 T574 E575 E576 G577 S578 S579 R580 Q581 E582 N583 A584 Q585 K586 A587 L588 G589 A590 V591 S592 K593 I594 I595 E596 R597 C598 S599 A600 A768 P769 A770 K771 T772 E773 G774 R775 R817 Q821 R824 A828 S831 S832 T835 )