Chain A ( P9 S10 T11 H12 F13 K14 M15 Y16 K17 S18 G19 K20 K21 W22 I23 F24 H41 V154 A155 G157 A158 I159 G161 W162 Y165 K166 V167 L168 P169 S170 N171 N172 Q173 V174 A175 Q176 A177 I178 V179 E180 S181 L188 A192 H193 N194 L195 F196 G197 I198 K199 G200 S201 Y202 N205 S206 V207 M209 R210 T211 R212 E213 V214 Y215 G216 G217 R218 S219 Y221 A224 N225 F226 R227 A228 Y229 N231 N232 S233 E234 S235 V236 T237 D238 H239 G240 R241 F242 L243 N244 V245 N246 R248 Y249 N251 L252 L253 V261 A262 N263 K264 L265 R266 Q267 D268 G269 Y270 A271 T272 D273 P274 S275 Y276 A277 T279 L280 F283 )