Chain A ( Q34 I35 S37 G38 L39 M40 L41 S42 F43 F44 Y45 V46 P47 A52 F53 T56 V59 M60 G66 W67 V69 R70 L71 H73 S74 F75 V77 S78 F81 A115 T116 A117 F118 V119 G120 Y121 V122 L123 P124 D125 G126 M128 S129 F164 F165 S166 I167 H168 V169 I170 L171 P172 I234 S235 F237 Q238 A239 D240 P241 D242 N243 S244 I245 H255 I256 I257 P258 E259 W260 Y261 L262 L263 Y266 )