_struct_ref_seq_dif.pdbx_ordinal 1 _struct_ref_seq_dif.align_id algn2 _struct_ref_seq_dif.seq_num 181 _struct_ref_seq_dif.db_mon_id GLU _struct_ref_seq_dif.mon_id PHE _struct_ref_seq_dif.details ; A point mutation was introduced in the CAP at position 181 substituting PHE for GLU. ;