| Enumerations for _Chem_comp_atom.Substruct_code (A closed enumeration) | |
|---|---|
| base | 'base of a nucleic acid' |
| main | 'main chain of an amino acid' |
| none | 'not appropriate for this monomer' |
| phos | 'phosphate of a nucleic acid' |
| side | 'side chain of an amino acid' |
| sugar | 'sugar of a nucleic acid' |