Chain A ( S23 F26 G27 Y28 N29 T30 F72 S73 G76 G79 S80 V83 I129 G130 C133 G134 L135 T137 G138 P141 R153 G154 A155 G157 T158 L159 H160 Q161 L162 G163 I164 V165 V166 G167 I168 Q279 Q282 Q283 I287 N288 Y292 N317 T318 A319 F320 T321 V322 V323 S324 L325 F326 V327 V328 Q329 R333 V376 F379 E380 V381 P383 G384 P385 I386 P387 W388 F389 I390 V391 I404 A405 V406 A407 G408 F409 S410 N411 W412 T413 S414 N415 G419 )