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You'll need this only if you want to test how the new genome directory looks OK when visited in a Web browser. How you do this will depend on your computer.
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Now, the basic structure - sequence and meta-data about contigs and chromosomes - is available. Now you need to add the annotations. For this, see:
Updating mRNA, EST, and RefGene UCSC data sets set for an existing genome in IGB QuickLoad