Robert N. Kirchdoerfer2 articles listing Robert N. Kirchdoerfer in PNAS, Science Advances, indexed by Paperzzz from Crossref and OSF.Copy-back RNA synthesis by coronavirus polymerase requires helicase activity and is stimulated by remdesivir and molnupiravir Science AdvancesSARS-CoV-2 nsp15 enhances viral virulence by subverting host antiviral defenses PNAS