Chain A ( T260 G261 A262 G263 V264 S265 V266 S267 S268 G269 I270 P271 D272 F273 R274 S275 Q294 F297 D298 F309 I316 Y317 P318 G319 Q320 F321 Q322 P323 S324 L325 C326 H327 K328 T344 Q345 N346 I347 D348 T349 L350 E351 Q352 V353 A354 G355 I359 Q361 C362 H363 G364 S365 F366 A367 T368 C380 E381 R384 P409 E410 I411 V412 F413 F414 G415 L418 P419 I439 G440 S441 S442 L443 K444 V445 P447 N465 R466 E467 L479 G480 D481 C482 D483 V484 I485 L500 S501 S502 N503 K506 G654 A655 E656 )