IFNB1 and infection: IFN-α and IFN-β productions upon infection with RSV were stronger in neonatal IRAPKO AMs (41.0 ± 31.7 pg/mL and 492.7 ± 384.1 pg/mL, respectively, Fig. 4a, b) than in neonatal WT AMs (1.08 ± 1.31 pg/mL and undectable, respectively, Fig. 4a, b).