| Allowed Value | Details | 
|---|---|
| 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 | 
| Allowed Value | Details | 
|---|---|
| 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 |