I'm a Canadian postdoc living in Germany, working on evolutionary biology questions with single cell RNAseq methods. Very generally, I try to find quantitative ways to show the relatedness of cells which are ... well, related.

Think: "The mouse eye is a lot like the human eye, and the cells in each eye are quite like the cells in the other." Now, let's make that a quantitative statement, and let's compare different animals where the similarities are not quite so obvious.