Data Item _pdbx_investigation_focus.comp_ref_db_code
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General 
- Item name
- _pdbx_investigation_focus.comp_ref_db_code
- Category name
- pdbx_investigation_focus
- Attribute name
- comp_ref_db_code
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
More related reference information, for example an additional identifier for db and db_acc.
However, this additional identifier may not be unchanged between database releases
(aka it is not a stable_identifier and thus it is not enough to be the only identifier).
Data Type 
- Data type code
- code
- Data type detail
- Single word codes
- Primitive data type code
- char
- Regular expression
- [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*