Data Item _em_icos_virus_shells.triangulation_num
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General 
- Item name
- _em_icos_virus_shells.triangulation_num
- Category name
- em_icos_virus_shells
- Attribute name
- triangulation_num
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The triangulation number (T number) is a geometric and abstract
concept that does not correspond to the structural components of
an individul virus.
It refers to the organisation of the geometric figure.
The triangulation number, T is given by the following relationship:
T= h*2 + hk +k*2, where h and k are positive integers which define the
position of the five-fold vertex on the original hexagonal net.
Item Example
4
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]+