Data Item _ndb_struct_conf_na.feature
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General 
- Item name
- _ndb_struct_conf_na.feature
- Category name
- ndb_struct_conf_na
- Attribute name
- feature
- Required in PDB entries
- yes
- Used in current PDB entries
- Yes, in about 6.6 % of entries
Item Description
This data item identifies a secondary structure
feature of this entry.
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 |
|---|---|
| a-form double helix | |
| b-form double helix | |
| bulge loop | |
| double helix | |
| four-way junction | |
| hairpin loop | |
| internal loop | |
| mismatched base pair | |
| other right-handed double helix | |
| parallel strands | |
| quadruple helix | |
| tetraloop | |
| three-way junction | |
| triple helix | |
| two-way junction | |
| z-form double helix |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| a-form double helix | |
| b-form double helix | |
| bulge loop | |
| double helix | |
| four-way junction | |
| hairpin loop | |
| internal loop | |
| mismatched base pair | |
| other right-handed double helix | |
| parallel strands | |
| quadruple helix | |
| tetraloop | |
| three-way junction | |
| triple helix | |
| two-way junction | |
| z-form double helix |