Angiotensin-converting enzyme 2 (ACE2) acts as the extracellular receptor for the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (1, 2, 3), the virus responsible for the COVID-19 pandemic that has catastrophically affected the world since its first identification in December 2019 (4, 5, 6, 7). The gene discussed is ACE2; the disease is COVID-19.