Chain A ( Q39 A40 P41 G42 K43 G44 T87 T89 T108 T110 E148 T160 G162 V163 H164 T165 F166 P167 A168 V169 ),  Chain B ( Q37 Q38 K39 P40 G41 Q42 P43 P44 K45 A80 E81 D82 L83 A84 V85 K103 N137 N138 R142 E161 S162 V163 T164 E165 Q166 D167 S168 K169 D170 S171 T172 Y173 S174 S176 ),  Chain C ( P185 S186 S187 S188 L189 G190 T191 Q192 T193 Y194 K210 P213 )