Chain A ( K288 F289 Q290 Y291 Q292 L293 C295 D305 E306 A307 D308 S311 K312 A314 A315 E316 L329 M332 D333 S334 T336 A337 K338 R340 N341 I343 N344 E345 L348 R413 I414 E416 L417 S418 Q419 G420 G421 C422 M423 S424 S425 F426 R427 W428 I450 N516 L517 P518 K519 G520 R521 N522 N523 M524 F525 H526 )