Data Item _chem_comp_atom.atom_id
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General 
- Item name
- _chem_comp_atom.atom_id
- Category name
- chem_comp_atom
- Attribute name
- atom_id
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 0.001 % of entries
- Used in the Chemical Component dictionary
- Yes
Item Description
The value of _chem_comp_atom.atom_id must uniquely identify
each atom in each monomer in the CHEM_COMP_ATOM list.
The atom identifiers need not be unique over all atoms in the
data block; they need only be unique for each atom in a
component.
Note that this item need not be a number; it can be any unique
identifier.
Data Type 
- Data type code
- atcode
- Data type detail
- Character data type for atom names ...
- Primitive data type code
- char
- Regular expression
- [][ _(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Child Data Items 
- _atom_site.label_atom_id
- _chem_comp_angle.atom_id_1
- _chem_comp_angle.atom_id_2
- _chem_comp_angle.atom_id_3
- _chem_comp_bond.atom_id_1
- _chem_comp_bond.atom_id_2
- _chem_comp_chir.atom_id
- _chem_comp_chir_atom.atom_id
- _chem_comp_plane_atom.atom_id
- _chem_comp_tor.atom_id_1
- _chem_comp_tor.atom_id_2
- _chem_comp_tor.atom_id_3
- _chem_comp_tor.atom_id_4
- _pdbx_chem_comp_atom_feature.atom_id
- _pdbx_chem_comp_atom_related.atom_id
- _pdbx_entity_branch_link.atom_id_1
- _pdbx_entity_branch_link.atom_id_2
- _pdbx_entity_branch_link.leaving_atom_id_1
- _pdbx_entity_branch_link.leaving_atom_id_2
- _pdbx_entity_poly_comp_link_list.atom_id_1
- _pdbx_entity_poly_comp_link_list.atom_id_2
- _pdbx_entity_poly_comp_link_list.leaving_atom_id_1
- _pdbx_entity_poly_comp_link_list.leaving_atom_id_2
- _struct_conn.pdbx_ptnr1_leaving_atom_id
- _struct_conn.pdbx_ptnr2_leaving_atom_id