The monomer type found at this position in the sequence of
the entity or biological unit described in this data block.
This data item is a pointer to _chem_comp.id in the CHEM_COMP
category.
Additional Descriptive Information for Depositors
The reported wwPDB chemical component dictionary 3-letter identifier for the discrepant residue
Data Type
Data type code
ucode
Data type detail
code item types/single words (case insensitive) ...