ADAM-17 (a disintegrin and metalloproteinase-17), during physiological conditions and in SARS-CoV infection, can cleave mACE2, resulting in shedding and soluble ACE2 (sACE2) [2, 3], a process also associated with ALI (acute lung injury) . High mACE2 and/or high ADAM-17 activity may therefore facilitate SARS CoV-2 infection and severe COVID-19 ... More @Wikipedia
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