I was asked this question very often: “Tommy, what’s the p-value cutoff should I use to determine the differentially expressed genes; what log2 Fold change cutoff should I use too?”

For single-cell RNAseq quality control, what’s the cutoff for mitochondrial content?

My answer is always: it depends. I was joking: determining a cutoff is 90% of the work a bioinformatician does.

Why is that?

Biology is more than just statistics. Several examples:

<ol …