Chain A ( M848 L875 T1208 E1209 A1210 L1211 S1213 L1326 D1327 A1328 T1329 S1330 G1331 G1332 T1333 L1334 S1335 H1336 S1337 V1338 M1339 V1340 Y1341 W1342 R1345 Q1349 W1361 V1362 L1372 K1385 L1386 A1387 E1388 K1389 V1390 H1391 S1392 P1393 G1394 V1395 L1415 S1563 V1565 Q1566 R1568 N1569 H1573 )