What ACE1 and ACE2 receptors do for some of your cells.

https://medicalxpress.com/news/2020-05-ace2-receptor-coronavirus.html

Sample quote

New clinical trial tests ACE inhibitor against SARS-CoV-2

In collaboration with a multidisciplinary group of investigators, Dr. Loomba has initiated a multicenter (randomized, double-blinded, placebo-controlled) clinical trial to examine the efficacy of
ramipril - an ACE inhibitor—
compared to a placebo in reducing mortality, ICU admission or need for mechanical ventilation in patients with COVID-19.