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You can also open custom genomes not already available in IGB. See Custom Genomes (Genomes not in IGB).
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Open data sets - from files, URLs, Quickload sites,
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UCSC Genome Browser, or other sources
Once you select a species and genome version, publicly accessible data sets hosted by UCSC Genome Browser, IGB Quickload sites, and other sources will appear in the Available Data section of the Data Access tab. Select these data sets to open them in IGB.
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