ZBP1 and viral infectious disease: To assess whether RIPK3 and ZBP1 condensed together into OASL liquid droplets during virus infection, Oasl1–/– primary fibroblasts complemented with OASL1–mCherry were infected with MCMV-M45mutRHIM and subsequently immune-stained for endogenous RIPK3 and ZBP1.