Chain A ( I68 W69 Y70 G71 S72 T74 A75 F76 L77 Q78 S79 W80 L82 R84 K85 I86 G87 L88 S89 I90 A91 A92 T93 P94 L95 L96 P97 L98 F99 C100 R113 S114 M115 R116 C117 P118 A119 A120 K121 F122 A123 T124 H125 V126 V127 S128 H129 F130 L131 F132 L133 I134 L136 W189 S310 R313 T314 T315 Y316 L317 M318 P319 A320 F321 E322 A323 L324 G325 P326 W478 A481 R482 Q484 L485 W486 L487 Y489 I490 F536 )