Chain A ( L121 E122 S123 E124 Y125 N126 P127 A128 I129 S130 C131 F132 R133 V134 T136 S137 G173 F174 V175 F176 G177 S178 A179 M180 V181 C182 L183 E184 V185 R186 R187 R188 K189 Y190 M191 E192 S194 K195 Y198 N201 F238 K246 T249 P250 L251 L253 I254 L258 N259 H316 G319 V320 Q321 T322 G323 L324 Y325 M326 H327 K328 N329 R330 S331 D335 L336 K338 V339 A340 L343 L384 L385 S386 S387 L388 L389 L390 G391 D392 I393 L395 S396 K399 L406 V407 P408 C409 S410 W411 K412 L413 I414 P429 E432 M434 E435 P436 S437 I441 T442 A443 L444 N445 R446 K447 Q448 L449 I450 F452 Y495 D498 K499 T500 V501 Q502 F503 W504 )