| Qualifier | gene_synonym |
| Definition | synonymous, replaced, obsolete or former gene symbol |
| Value Format | "free text" |
| Example |
<INSDQualifier_value>Hox-3.3</INSDQualifier_value>in a feature where the gene qualifier value is Hoxc6 |
| Comment | used where it is helpful to indicate a gene symbol synonym; when used, a primary gene symbol must always be indicated in a gene qualifier |