Data Item _em_helical_entity.dyad
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General 
- Item name
- _em_helical_entity.dyad
- Category name
- em_helical_entity
- Attribute name
- dyad
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Value should be YES if a the filament has two-fold symmetry perpendicular to the helical axis.
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| NO | |
| YES |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| NO | |
| YES |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _em_helical_entity.axial_symmetry | replacedby |