Data Item _entity.id
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General 
- Item name
- _entity.id
- Category name
- entity
- Attribute name
- id
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 100.0 % of entries
Item Description
The value of _entity.id must uniquely identify a record in the
ENTITY list.
Note that this item need not be a number; it can be any unique
identifier.
Data Type 
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Child Data Items 
- _atom_site.label_entity_id
- _entity.pdbx_parent_entity_id
- _entity_keywords.entity_id
- _entity_link.entity_id_1
- _entity_link.entity_id_2
- _entity_name_com.entity_id
- _entity_name_sys.entity_id
- _entity_poly.entity_id
- _entity_src_gen.entity_id
- _entity_src_nat.entity_id
- _pdbx_branch_scheme.entity_id
- _pdbx_chain_remapping.entity_id
- _pdbx_construct.entity_id
- _pdbx_entity_assembly.entity_id
- _pdbx_entity_branch.entity_id
- _pdbx_entity_branch_descriptor.entity_id
- _pdbx_entity_branch_list.entity_id
- _pdbx_entity_func_bind_mode.entity_id
- _pdbx_entity_name.entity_id
- _pdbx_entity_nonpoly.entity_id
- _pdbx_entity_poly_domain.entity_id
- _pdbx_entity_poly_na_nonstandard.entity_id
- _pdbx_entity_poly_na_type.entity_id
- _pdbx_entity_poly_protein_class.entity_id
- _pdbx_entity_prod_protocol.entity_id
- _pdbx_entity_remapping.entity_id
- _pdbx_entity_src_gen_character.entity_id
- _pdbx_entity_src_gen_chrom.entity_id
- _pdbx_entity_src_gen_clone.entity_id
- _pdbx_entity_src_gen_express.entity_id
- _pdbx_entity_src_gen_fract.entity_id
- _pdbx_entity_src_gen_lysis.entity_id
- _pdbx_entity_src_gen_prod_digest.entity_id
- _pdbx_entity_src_gen_prod_other.entity_id
- _pdbx_entity_src_gen_prod_pcr.entity_id
- _pdbx_entity_src_gen_proteolysis.entity_id
- _pdbx_entity_src_gen_pure.entity_id
- _pdbx_entity_src_gen_refold.entity_id
- _pdbx_entity_src_syn.entity_id
- _pdbx_linked_entity_list.entity_id
- _pdbx_prerelease_seq.entity_id
- _pdbx_sifts_xref_db.entity_id
- _pdbx_sifts_xref_db_segments.entity_id
- _pdbx_struct_entity_inst.entity_id
- _struct_asym.entity_id
- _struct_ref.entity_id