Chain A ( P172 L173 K174 C175 G176 V177 S178 N179 K180 D181 N272 V274 G275 G276 A277 G278 D279 V280 L281 G282 N283 V285 Q286 F309 G310 G311 T312 G314 M315 A316 F317 V318 G319 T320 S323 S325 H326 H347 H351 G354 M355 N356 H357 D358 D359 R361 M372 N373 S374 G375 S383 S384 C385 S386 A387 E388 D389 F390 K392 L393 M516 Q518 Q523 V526 I527 R549 N552 C553 G554 F555 S556 G557 N558 E559 Y560 K561 N567 C570 G571 K572 V583 F584 G585 I586 V587 D604 F605 Q606 L607 G608 S609 D610 V611 P612 D613 P614 G615 M616 V617 N618 E619 T621 C629 R630 N631 F632 Q633 )