Chain A ( T70 S103 K104 F183 Y185 P186 Q187 P188 T189 K192 L193 K195 E196 N197 M199 E200 F232 E233 T235 M236 A237 K238 S239 R240 L241 K242 T243 L244 T245 D246 L247 R248 S249 V250 R251 F377 M385 I388 L389 F390 T392 E393 R394 V395 T396 A397 N398 P452 M453 E454 L455 S456 I457 A458 V459 N460 L463 V467 I471 F472 C473 T474 E475 P476 F477 R478 I479 P480 F481 K821 P910 L911 V912 K913 L914 G915 D916 M919 S921 P922 F923 T924 T947 )