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To add a new assembly, click on Settings -> Library files. From the Assembly drop-down list, select Add assembly . Specify and specify a species, if you can't find . If the species name is not in the list, choose Other, and type in the species name and with assembly version (you may have multiple assembly versions for one species, e.g. hg19 and hg38 for Homo Sapiens). You need to add the reference file which is a .fasta file containing sequence information. Once the reference file is added, you can build any aligner index to perform the alignment task. 

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