Changes

== Left alignment ==

== Left alignment ==

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.

* <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>