ACE2 and infection: This includes bronchoalveolar lavages (BALs) (Liao et al., 2020), as well as nasopharyngeal swabs (Chua et al., 2020) of patients infected with COVID-19 , and transcriptome studies of normal human bronchial epithelial (NHBE) cells, A549 cells with and without ACE2 expression, and also Calu-3 cells upon infection with SARS-CoV-2 (Blanco-Melo et al., 2020).