Chain A ( G28 I29 L30 L31 V32 L33 Q34 I35 I36 S37 G38 L39 M40 L41 S42 F43 Y45 A52 F53 T56 M60 G66 W67 F68 V69 R70 L71 Y72 H73 S74 F75 G76 V77 S78 F79 Y80 F81 F82 A115 T116 A117 F118 V119 G120 Y121 V122 L123 P124 D125 G126 Q127 M128 S129 H168 V169 I170 L171 P172 V173 I225 S229 F233 I234 S235 I236 F237 Q238 A239 D240 P241 D242 N243 S244 I245 L246 P253 H255 I256 I257 P258 E259 W260 Y261 Y266 K330 )