Chain A ( I1116 L1118 R1120 G1121 L1122 G1123 H1124 G1125 A1126 F1127 G1128 E1129 V1130 Y1131 E1132 G1133 V1147 A1148 V1149 K1150 T1151 L1152 F1164 E1167 I1171 V1180 R1181 C1182 I1183 F1193 I1194 L1195 M1196 E1197 L1198 M1199 A1200 R1253 N1254 C1255 L1256 G1269 D1270 F1271 G1272 M1273 R1275 )