IFNL2 and breast cancer: We observed robust induction of both type I IFN (IFNB1) and type III IFNs (IFNL1, IFNL2, and IFNL3) in ciliated, basal, club, and BC/club (Figs 5A–4D, S1 Data) cells co-expressing SARS-CoV-2 transcripts.