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I am at this point in the GitHub tutorial: https://github.com/DerrickWood/kraken2/blob/master/docs/MANUAL.markdown#standard-kraken-2-database

It says to create the standard Kraken database, I use the following command:

kraken2-build --standard --db $DBNAME

It then says to change $DBNAME with the preferred database name/location. Is this something that I need to download on my own? Where can I find it, and how do I do it?

To provide context, I want to use Kraken2 to identify whether or not there is the presence of MCPyV in a tumor sample.

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\$DBNAME is a folder location on your computer; you specify it yourself, for example:

kraken2-build --standard --db /media/ip80/externalDrive/kraken_indexes/betterThanGenbank
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