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splitFastq.pl will need tweaking in the future, until sample names and the format of the key for demultiplexing and metadata stabilizes. The number of columns in the demux key has differed among some of our completed sequence lanes. Brew_20_DEMUX.csv has 10 columns: forward_barcode,reverse_barcode,locus,samplename,project,wellposition,plate,midplate,substrate,client_name.