COVID-19(18) SARS-CoV-2(18) histone modifications(7) ACE2(6) Protein(6) histone(6) Epigenetic(6) regulate(6) respiratory(6) SARS-COV-2 infection(6) approach(5) feature(5) severe COVID-19(4) SLC6A20(4) proportion(4) viral entry(4) acute respiratory syndrome(4) upregulating(4) NRP1(4) expression(4) HeK9me3(4) smoker(4) favor(4) smoking(4) Alter(4) implicated(4) Viral(4) receptors(4) H3K27me3(4) Evidence(4)