Data Item _pdbx_nmr_chem_shift_ref.external_ref_loc
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General 
- Item name
- _pdbx_nmr_chem_shift_ref.external_ref_loc
- Category name
- pdbx_nmr_chem_shift_ref
- Attribute name
- external_ref_loc
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
External chemical shift references are defined as either located within
the sample (e.g., as a capillary) or external to the sample and are inserted into
the spectrometer before, after, or both before and after the sample containing
the molecular system studied in the entry.
Additional Descriptive Information for Depositors
When external (capillary) is used as a referencing method, the location of the sample tube.
Item Example
insert at center of experimental sample tube
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 |
|---|---|
| insert at center of a separate sample tube | |
| insert at center of experimental sample tube | |
| insert at outer edge of a separate sample tube | |
| insert at outer edge of experimental sample tube | |
| other | |
| separate tube (no insert) not similar to the experimental sample tube | |
| separate tube (no insert) similar to the experimental sample tube |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| insert at center of a separate sample tube | |
| insert at center of experimental sample tube | |
| insert at outer edge of a separate sample tube | |
| insert at outer edge of experimental sample tube | |
| other | |
| separate tube (no insert) not similar to the experimental sample tube | |
| separate tube (no insert) similar to the experimental sample tube |