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RFC: Should we migrate to fully-justified alignments? #222

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@reece

When aligning sequences with indels in repeat regions, the alignment is ambiguous. Most aligners implicitly right or left shuffled gaps, but this choice is arbitrary: the real region of ambiguity spans from the left extreme to the right extreme. The result is that it’s hard to know whether a particular region is within an ambiguity region.

Proposal: Based on work from NCBI, GA4GH adopted fully-justified normalization for the GA4GH VR specification.

Migrating UTA alignments to fully-justified would allow relatively simple tests for whether a variant overlaped a region of ambiguity.

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