ACE2, ACE2 K26R, ACE2 protein-, ACE2 protein-altering variants, ACE2 variants, COVID-19, D355N, D38V, D509Y, E23K, E35K, E37K, F72V, G326E, G352V, H34R, H378R, Human, Human ACE2 receptor, I21V, K26R, K31R, K68E, M62V, N33I, N64K, Q102P, Q388L, S-protein, S19P, SARS, SARS-CoV, SARS-CoV S-protein, SARS-CoV-2, T92I, Y50F, Y83H, host cells, human, human angiotensin-converting enzyme 2 (ACE2) receptor, polymorphisms, respiratory illness, viral spike (S) protein