Data Item _cell.Z_PDB
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General 
- Item name
- _cell.Z_PDB
- Category name
- cell
- Attribute name
- Z_PDB
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 87.4 % of entries
Item Description
The number of the polymeric chains in a unit cell. In the case
of heteropolymers, Z is the number of occurrences of the most
populous chain.
This data item is provided for compatibility with the original
Protein Data Bank format, and only for that purpose.
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- [+-]?[0-9]+
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 1 | +∞ |