In PMH, quantification of Ifnb1, Ifnl2, and Ifnl3 transcript levels [murine Ifnl1 is a pseudogene (Hermant et al., 2014)] showed that infection elicited the expression of only Ifnb1, which was 40 times higher at 24 h than at 72 h p.i. (Figure 3D). Here, IFNL1 is linked to infection.