Chain A ( Y27 Y28 T29 S30 W31 S32 Q33 Y34 R35 G39 S40 C41 S57 F58 E70 G98 W99 W139 L140 Y141 A177 L178 S179 S202 I203 M204 Y206 D207 F208 H219 F261 G262 R263 R286 F287 T288 K289 E290 T293 L294 A295 Y297 E298 W352 A353 D355 L356 )