Atf3CreERT2; ROSA26LSL-tdTomato (Atf3-tdTm) adult mice (5–13 weeks old) received 200 mg/kg tamoxifen by oral gavage 8 days after H1N1 influenza injury (8 dpi) and were treated with EdU ad libitum in their drinking water from 8 to 14 dpi. The gene discussed is ATF3; the disease is swine influenza.