I have a dataset composed of 2 samples, one is control and the other is experimental. I am having trouble figuring out how to use sc.tl.rank_genes_groups to compare the samples with respect to the Louvain clustering. For example, in Cluster 1, I want to determine DEGs from experimental with respect to control… for cluster 2, I want to determine DEGs from experimental with respect to control. When I try to edit the ‘reference’ criteria, it does not allow me to pass an adata.obs variable. Could someone give some advice? Thanks!