ACE2 and colon adenocarcinoma: Examples include the human liver carcinoma cell line HuH-7 and the human colon adenocarcinoma cell line CaCo-2, which are both susceptible to SARS-CoV-2 (Chu et al., 2020), as well as the A549 human carcinoma epithelial cells and the FT293 human embryonal kidney (HEK) cells expressing angiotensin-converting enzyme 2 (ACE2).