Chain A ( T12 G13 V14 A15 S16 K17 L18 S19 I20 A21 Y22 G23 I24 T38 Q40 N41 K43 L44 C63 D64 V65 A66 V89 H90 S91 I92 G93 F94 A95 P96 G97 L100 K114 I115 A116 H117 D118 I119 S120 L144 S145 Y146 Y156 M159 A162 K163 E167 I192 R193 T194 L195 A196 A197 S198 G199 I200 F203 )