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A variant is left aligned if it is no longer possible to shift its position to the left while keeping the length of all alleles constant.
A variant is left aligned if it is no longer possible to shift its position to the left while keeping the length of all alleles constant.
The following figure shows examples of an unnormalized short tandem repeat which is a special class of indels.
* <span style="color:#ff0000">The representation of variants in a VCF file requires that no alleles in the REF and ALT field are represented with an empty string (empty allele). The red indel is an illegal VCF representation.</span>
* <span style="color:#ff0000">The representation of variants in a VCF file requires that no alleles in the REF and ALT field are represented with an empty string (empty allele). The red indel is an illegal VCF representation.</span>
