Chain A ( A13 G14 L15 P16 R17 T18 G19 T20 K21 S22 L23 K24 N25 Y36 H37 M38 F39 E40 I41 I42 T90 D91 L92 P93 T94 C95 G96 F97 L112 T113 I114 R115 D116 K117 Y118 D119 W120 L121 H122 S123 L124 R125 K126 V127 V128 L129 P130 I140 G143 D144 L149 F153 Y154 L156 T157 E158 D159 S160 L161 F163 A164 Y182 Y185 N186 L201 R202 L203 G204 Y224 P225 C226 V227 N228 S229 H230 H231 Q232 M233 T234 T237 )