Chain A ( L164 V165 R166 E167 A169 S170 G171 K172 Y173 Y174 A175 L200 R204 H205 P206 F207 L208 T209 S210 L211 K212 Y213 M225 E226 Y227 V228 N229 G230 E254 N276 M278 L279 D280 K281 D282 G283 H284 I285 K286 I287 T288 F290 Y414 K416 K423 V426 S428 E429 D431 T432 F435 Y473 S474 A475 S476 G477 R478 E479 )