The RBD of 2019-nCoV differs largely from the SARS-CoV at the C-terminus residues (Figure 1(c)). Our results implied that such a difference did not result in drastic changes in the capability to engage the ACE2 receptor, but had a critical impact on the cross-reactivity of neutralizing antibodies. Some of the most potent SARS-CoV-specific neutralizing antibodies (e.g. m396, CR3014) that target the receptor binding site of SARS-CoV failed to bind 2019-nCoV spike protein, indicating that it is necessary to develop novel monoclonal antibodies that could bind specifically to 2019-nCoV RBD. Interestingly, it was reported that the antibody CR3022 completely neutralized both the wild-type SARS-CoV and the CR3014 escape viruses at a concentration of 23.5 μg/ml, and that no escape variants could be generated with CR3022 [5]. Furthermore, the mixture of CR3022 and CR3014 neutralized SARS-CoV in a synergistic fashion by recognizing different epitopes on RBD [5]. These results suggest that CR3022 has the potential to be developed as candidate therapeutics, alone or in combination with other neutralizing antibodies, for the prevention and treatment of 2019-nCoV infections. We expect more cross-reactive antibodies against 2019-nCoV and SARS-CoV or other coronaviruses to be identified soon, facilitating the development of effective antiviral therapeutics and vaccines.