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Data items in the STRUCT_REF_SEQ_DIF category provide a
mechanism for indicating and annotating point differences
between the sequence of the entity or biological unit described
in the data block and the sequence of the referenced database
entry.
Example 1 - based on laboratory records for CAP-DNA complex.
_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.
;