Feature	variation
Definition	a related strain contains stable mutations from the same gene (e.g., RFLPs, polymorphisms, etc.) which differ from the presented sequence at this location (and possibly others)
Optional Qualifiers	/allele="free text" /compare=[accession-number.sequence-version] /frequency="free text" representing the proportion of a population carrying the feature expressed as a fraction /gene="free text" /gene_synonym="free text" /map="free text" /note="free text" /phenotype="free text" /product="free text" /replace="free text" /standard_name="free text"
Comment	used to describe alleles, RFLP's,and other naturally occurring mutations and polymorphisms; variability arising as a result of genetic manipulation (e.g. site directed mutagenesis) should be described with the misc_difference feature; use the replace qualifier to annotate a deletion, insertion, or substitution.