Chain A ( R184 L185 I186 G187 L188 A189 L190 A191 T192 G193 V194 A195 I196 L305 Q306 S307 L308 M309 Y310 L311 N312 Q313 T315 L316 A317 I319 H320 S322 G323 L324 P325 A326 A327 S328 W331 Q332 N335 A336 L337 L338 V339 S340 T343 H344 L346 M347 )