Tumor National Center for Biotechnology Information NCBI NLM MEDLINE Mice covid-19 sars-cov-2 animals humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't Antibodies cell line Inbred BALB C Receptors pneumonia viral / immunology chlorocebus aethiops vero cells transfection viral / virology protein binding coronavirus infections / prevention & control* pandemics / prevention & control* viral / prevention & control* specific pathogen-free organisms hek293 cells betacoronavirus / immunology* coronavirus infections / virology spodoptera covid-19 vaccines pmid:32645327 pmc7321023 doi:10.1016/j.cell.2020.06.035 lianpan dai tianyi zheng george f gao angiotensin-converting enzyme 2 neutralizing / immunology betacoronavirus / chemistry middle east respiratory syndrome coronavirus / chemistry middle east respiratory syndrome coronavirus / immunology* peptidyl-dipeptidase a / genetics peptidyl-dipeptidase a / metabolism protein interaction domains and motifs / immunology virus / metabolism sars virus / chemistry sars virus / immunology* sf9 cells universal design* vaccination / methods viral vaccines