COVID-19(22) SARS-CoV-2(20) acute respiratory syndrome coronavirus(19) acute respiratory syndrome(19) molecular(16) severe acute respiratory syndrome Coronavirus(15) Infection(14) coronavirus(14) Analysis(12) the spike protein(12) Spike protein(12) ACE2(10) RBD(10) angiotensin(10) acute respiratory syndrome coronavirus 2(10) pathway(10) the SARS-CoV-2(9) Mutation(8) molecular dynamics(7) Contact(7) the receptor-binding domain(7) angiotensin-converting enzyme 2(7) RBD residue(7) Receptor-binding domain(7) Angiotensin-converting enzyme(7) virus(7) free energy(7) receptor(7) complex(7) reduce(7)