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change
exprDT[, genes := as.character(rep(x = geneDT$gene, geneDT$count))]
to
exprDT[, genes := as.character(rep(x = geneDT$geneName, geneDT$count))]
I get the stomics data, and they change the colname gene to geneName.
May be we need to think about a better way to extract this specific column, or just specify the second column, i am not sure whether the order would be changed too, just an advice.