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Expression and function of ACE2 in the lungs in the coronavirus disease 2019 (COVID-19) era. Abbreviations: ACE2, angiotensin-converting enzyme 2; SARS-CoV-2, severe acute respiratory distress syndrome coronary virus 2; ATI cell, lung alveolar epithelial type I cell; ATII cell, lung alveolar epithelial type II cell; ANG, angiotensin; RAASi, renin–angiotensin–aldosterone system inhibitors.
