Data Item _chem_shift_ref.atom_group
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General 
- Item name
- _chem_shift_ref.atom_group
- Category name
- chem_shift_ref
- Attribute name
- atom_group
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
Group of atoms within a molecule whose chemical shift was used as the standard
chemical shift reference for the defined observed nuclei.
Item Example
'methyl protons'
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|^-]*
- Values limited by enumeration list
- no
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| methyl carbon | |
| methyl carbons | |
| methyl protons | |
| methylene protons | |
| nitrogen | |
| protons |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| methyl carbon | |
| methyl carbons | |
| methyl protons | |
| methylene protons | |
| nitrogen | |
| protons |