CPT1A and infection: To assess the dynamics of airway epithelial repair upon damage, we infected R26 CreERT2 Cpt1af/f and R26 CreERT2 Cpt1a+/+ mice with Influenza A virus (strain X31) and analysed the cellular composition of the airway epithelium 10 days post infection, at a point in time when regeneration is well underway in this infection model30 (Fig. 4e, f).