Data Item _pdbx_helical_symmetry.dyad_axis
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General 
- Item name
- _pdbx_helical_symmetry.dyad_axis
- Category name
- pdbx_helical_symmetry
- Attribute name
- dyad_axis
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 0.1 % of entries
Item Description
Two-fold symmetry perpendicular to the helical axis.
Additional Descriptive Information for Depositors
Two-fold symmetry perpendicular to the helical axis.
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*|+-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| no | |
| yes |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| no | |
| yes |