Data Item _geom_torsion.atom_site_label_atom_id_4
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General 
- Item name
- _geom_torsion.atom_site_label_atom_id_4
- Category name
- geom_torsion
- Attribute name
- atom_site_label_atom_id_4
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
An optional identifier of the fourth of the four atom sites that
define the torsion angle.
This data item is a pointer to _atom_site.label_atom_id in the
ATOM_SITE category.
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|^-]*
