| Qualifier | mod_base |
| Definition | abbreviation for a modified nucleotide base |
| Value Format | modified base abbreviation chosen from this Annex, Table 2 |
| Example |
<INSDQualifier_value>m5c</INSDQualifier_value><INSDQualifier_value>OTHER</INSDQualifier_value>
|
| Comment | specific modified nucleotides not found in paragraph 2 of this Annex are annotated by entering OTHER as the value for the mod_base qualifier and including a note qualifier with the full name of the modified base as its value |