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Protein Data Bank exchange dictionary (pdbx) version 1.0521
_struct_ref_seq.seq_align_beg
Name:'_struct_ref_seq.seq_align_beg'
Definition:
The sequence position in the entity or biological unit described in the data block at which the alignment begins. This data item is a pointer to _entity_poly_seq.num in the ENTITY_POLY_SEQ category.
Mandatory item: yes