Chain A ( V9 T10 G11 A12 G14 Q15 I16 A17 Y18 S19 L40 L41 D42 I43 T71 D72 A77 F78 I85 L86 V87 G88 S89 M90 P91 R92 R93 E97 L101 N105 V106 K107 I108 F109 K110 S111 Q112 G113 L116 V128 V129 G130 N131 N136 L155 L158 H187 I235 R238 K239 L240 S241 S242 A243 M244 A246 )