SARS-CoV-2(13) analysis(9) receptor(7) expression(7) ACE2(7) investigated(7) molecular(7) host cells(7) angiotensin-converting enzyme 2(7) downregulated(7) complex(7) coronavirus(7) damage(7) Protein(7) coronavirus disease(6) therapeutic(6) acute respiratory syndrome(6) Infection(6) provide(6) identify(6) host cell(6) endocytic(4) Proteins(4) cleavage(4) subunit(4) pluripotent stem cell(4) the spike protein(4) Structure(4) spike protein.(4) Spike proteins(4)