COVID-19(17) SARS-CoV-2(15) Spike protein(11) Interaction(10) ACE2(8) facilitate(7) Cell(7) manifested(7) Activation(7) Local(7) respiratory(7) Protein(7) Effect(7) coronavirus(7) pandemic(6) immune system(6) Inflammation(6) Vaccine(6) acute respiratory syndrome(5) mutant(4) cellular and molecular(4) Syncytia(4) N-terminal domain(4) spike(4) cGAS(4) mechanism(4) Receptor binding(4) omicron(4) high infectiousness(4) Receptor-binding domain(4)