Chain A ( Q8 A9 G10 Q11 C12 G13 N14 Q15 I16 E69 T72 A97 G98 N99 N100 H137 S138 L139 G140 G141 G142 T143 G144 S145 M147 G148 V169 V170 P171 D177 T178 V179 V180 E181 N184 N204 Y222 L225 N226 A444 )