| Qualifier | allele |
| Definition | name of the allele for the given gene |
| Value Format | "text" |
| Example | /allele="adh1-1" |
| Comment | all gene-related features (exon, CDS etc) for a given gene should share the same /allele qualifier value; the /allele qualifier value must, by definition, be different from the /gene qualifier value; when used with the variation feature key, the allele qualifier value should be that of the variant. |