DPP4 and COVID-19: Analyzing the complete ACE2 interaction network, Wicik et al [52] listed several element genes (ACE2, ANPEP, DPP4, CCL2, MEPIA, TFRC, ADAM17, NPC1, FABP2, TMPRSS2, CLEC4M) and all of these genes were identified as COVID-19–associated in our automatically prepared knowledge base.