CDH5 and swine influenza: Cdh5-CreERT2; ROSA26LSL-tdTomato (Atf3EC-WT) and Cdh5-CreERT2; ROSA26LSL-tdTomato; Atf3lox/lox (Atf3EC-KO) adult mice (5–15 weeks old) received 200 mg/kg tamoxifen by oral gavage 2 weeks before H1N1 influenza injury or PBS administration (control).