DPP4 and fatty liver disease: To infer whether expression of ACE2, TMPRSS2, and DPP4 mRNAs in fatty liver disease tissues was associated with inflammatory infiltration, we explored the GSE33814 dataset composed of 13 normal livers, 19 steatoses, and 12 steatohepatitides25 and searched for correlations with immune cell subset-specific markers, according to the IRiS immune cell repository36 (Fig. S10B).