Chain A ( I944 G945 D946 R947 H948 N949 N951 I952 H967 G970 N971 Y972 K973 S974 F975 L976 G977 I978 N979 K980 E981 R982 V983 P984 F985 V986 Y1050 T1081 V1082 Q1083 F1084 N1085 W1086 L1088 H1089 L1092 )