Chain A ( V45 S48 C49 N52 I53 F54 G55 S103 G104 G105 V106 Y107 S108 M109 I110 I122 G123 L124 L125 Y126 V127 F128 G129 Q130 C131 V132 A133 G134 A135 Y137 K177 P242 A243 T245 G246 M248 A249 G250 F251 N252 M253 G254 D256 L257 I264 S320 A322 S323 C324 M325 G326 G327 L328 Y329 G330 A331 R333 I334 L335 C337 I338 V387 T388 I389 N390 F391 M392 L393 T394 Y395 )