Chain C ( C8 G9 S10 S11 D12 L13 T14 W15 K20 Y24 L27 L73 P74 F75 V76 L77 H78 S79 L80 R81 D82 T83 L88 C89 Q90 L91 S92 Q93 G94 Y96 L97 R100 Y101 S147 L148 V149 A150 R151 W152 L153 L154 G155 E158 G159 G160 F161 C162 F163 R164 S165 T166 R167 H168 N169 F170 S172 M173 A174 F175 P176 L177 L178 G179 L237 R240 L241 A242 V243 G244 W245 A247 L251 E252 I254 R255 R256 L258 Y259 S262 K263 )