AXL and infection: Real-time qRT-PCR results showed that the mRNA levels of Ifna and Ifnb were significantly higher in Axl−/−Mer−/− Sertoli cells than in WT, Axl−/−, and Mer−/− Sertoli cells 48 and 72 h after infection with 1.0 MOI of MuV (Figure 5A).