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In bioinformatics research, “BLAST” is a tool to search some input DNA or RNA sequence files (.fasta files in this example, which are formatted text files) again against genomic databases. This example is about using blastx on a folder containing 100 fasta files, and search these files against four existing databases. So the job array will invoke totally 100*4=400 sub-jobs. The example will cover all the steps needed, but assuming the mamba env, the blast software suit, and the blast databases are setup correctly.
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