ACE2 and COVID-19: This suggests that dysregulation in the function of angiotensin-converting enzyme-1/angiotensin II/ angiotensin II type 1 receptor (ACE1/Ang-II/AT1) axis and angiotensin-converting enzyme-2/ Angiotensin (1-7)/ MAS1 proto-oncogene (ACE2/Ang1-7/ MAS) axis play a critical role in the pathogenesis of COVID-19.