Chain A ( L25 E26 E27 K28 K29 V30 C31 N57 C58 E59 V60 V61 L62 G63 L65 F78 L79 T81 I82 Q83 E84 V85 A86 G87 Y88 V89 P100 L101 E102 N103 L104 Q105 I106 I107 R108 G109 N110 M111 Y113 Y117 A118 N139 L140 Q141 E142 I143 L144 H145 S169 K209 T211 C219 S220 G221 R222 C223 R224 D230 C231 C232 H233 N234 Q235 C236 A237 A238 G239 C240 T241 G242 P243 R244 E245 S246 D247 C248 L249 V250 C251 R252 K253 F254 R255 D256 E257 A258 T259 C260 K261 D262 T263 C264 P265 P266 K284 Y285 S286 F287 G288 A289 T290 C291 V292 P296 Y299 V300 G305 S306 C307 V308 )