Data Item _geom_contact.atom_site_label_alt_id_1
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General 
- Item name
- _geom_contact.atom_site_label_alt_id_1
- Category name
- geom_contact
- Attribute name
- atom_site_label_alt_id_1
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
An optional identifier of the first of the two atom sites that
define the contact.
This data item is a pointer to _atom_site.label_alt_id in the
ATOM_SITE category.
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*|+-]*
