Chain A ( L125 R126 G127 A128 T129 N130 P131 Y132 T133 E134 A135 N136 Y137 K138 P139 D144 L147 K148 L150 I151 L159 G235 P236 S237 R238 L239 K289 V315 I317 A599 M600 A601 V602 I603 M604 S605 L606 L607 E608 A609 D610 A611 )