Chain A ( R182 M206 L207 V208 R209 K210 R227 C270 H271 Q272 C273 R274 N286 D288 C289 W290 G291 V292 R293 G294 F296 C300 L301 R304 Y305 G306 E307 H319 C320 P321 P322 C323 R324 G325 I326 C327 N328 C329 S330 F331 C332 R333 Q334 R335 D336 G337 R338 C339 A340 T341 G342 H357 L360 K361 K364 E368 )