General ![](/assets/images/glyphicons-dot-com/png/glyphicons_195_circle_info.png)
- Item name
- _em_helical_entity.id
- Category name
- em_helical_entity
- Attribute name
- id
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 0.5 % of entries
Item Description ![](/assets/images/glyphicons-dot-com/png/glyphicons_195_circle_info.png)
Data Type ![](/assets/images/misc/regex-35.png)
- Data type code
- code
- Data type detail
- code item types/single words ...
- Primitive data type code
- char
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*