Chain A ( S30 E31 K32 K33 Y34 L35 R36 A37 M38 Q39 A40 N41 R42 Q44 K188 S189 I190 V191 N192 Q193 V194 F195 L196 R197 E198 R199 L270 M277 P278 F279 K280 K282 S358 Y359 G360 C375 S376 I377 C378 Q379 A380 E381 F382 Q383 K384 I386 L388 I389 C390 Q391 H392 I393 F394 C395 E396 E397 C398 M399 T400 L401 W402 F403 N404 R405 E406 K407 T408 C409 P410 L411 C412 R413 T414 V415 I416 S417 I420 D425 )