Data Item _pdbx_nmr_chem_shift_ref.ref_method
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General 
- Item name
- _pdbx_nmr_chem_shift_ref.ref_method
- Category name
- pdbx_nmr_chem_shift_ref
- Attribute name
- ref_method
- Required in PDB entries
- no
- Required for PDB deposition
- yes
- Used in currrent PDB entries
- No
Item Description
The chemical shift reference may be either internal (the compound is located
in the sample) or external (the compound is in a container external to the sample).
Additional Descriptive Information for Depositors
The chemical shift reference may be either internal (the compound is located in the sample) or external (the compound is in a container external to the sample).
Item Example
internal
Additional Item Example for Depositors
external (capillary)
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 |
|---|---|
| external | |
| internal | |
| na | not applicable |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| external | |
| internal | |
| na | not applicable |