Data Item _em_virus_shell.triangulation
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General 
- Item name
- _em_virus_shell.triangulation
- Category name
- em_virus_shell
- Attribute name
- triangulation
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 0.1 % of entries
Item Description
The triangulation number (T number) is a geometric
concept that refers to the organisation of subunits within the icosahedron.
The triangulation number, T is given by the 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
27
Data Type 
- Data type code
- positive_int
- Data type detail
- Positive integers (1,2,3,..)
- Primitive data type code
- numb
- Regular expression
- [1-9][0-9]*