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 0.2 % of entries
Item Description
The triangulation number, T, describes the organization of subunits within an
icosahedron. T is defined as T= h2 + h*k + k2, where h and k are positive
integers that 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]*