Data Item _pdbx_reference_entity_link.ref_entity_id_1
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General 
- Item name
- _pdbx_reference_entity_link.ref_entity_id_1
- Category name
- pdbx_reference_entity_link
- Attribute name
- ref_entity_id_1
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
- Used in the BIRD dictionary
- Yes
Item Description
The reference entity id of the first of the two entities joined by the
linkage.
This data item is a pointer to _pdbx_reference_entity_list.ref_entity_id
in the PDBX_REFERENCE_ENTITY_LIST category.
Data Type 
- Data type code
- ucode
- Data type detail
- code item types/single words (case insensitive) ...
- Primitive data type code
- uchar
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
