To perform a screen of genomic regions your alignments need to fulfill some requirements: The identifier of the first sequence in the first alignment is used as reference. Each provided alignment must contain a sequence with this identifier and at least for this reference sequence correct genomic positions must be provided in the alignment. The identifier can be of the form species.chrom. In that case each alignment is required to have a sequence from the reference species. Refer to the help pages for additional information an examples.

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