urface of ACE2. The overlay of SARS and nCOV-2019 RBD proteins is shown in Figure 1A. The binding interface in nCOV-2019 contains loops L1 to L4 and short β-strands β5 and β6 and a short helix α5. The location of RBM in nCOV-2019 RBD as well as different helices, strands, and loops is show