Chain A ( G167 E168 F169 L170 R171 R188 L189 L404 P412 I415 M416 V419 M423 F428 E429 W430 K431 V432 V433 N434 A435 Y436 H437 L438 R439 V440 R441 R442 K443 V451 K452 M453 S454 L455 Q456 L457 Y458 L466 L467 D468 F469 K470 S471 I472 D473 D474 V476 V477 E478 H535 F539 M542 )