Data items in the PDBX_SEQUENCE_PATTERN category record the number of occurences of common step sequence patterns (e.g. AA, CG, AT).
loop_ _pdbx_sequence_pattern.label_asym_id _pdbx_sequence_pattern.sequence_pattern _pdbx_sequence_pattern.pattern_count A GC 2 B GC 2 # - - - - data truncated for brevity - - - -