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Three pathogenic human coronaviruses have emerged, with SARS-2 causing a global pandemic. While therapeutic antibodies targeting the SARS-2 spike currently focus on the poorly conserved receptor-binding domain, targeting essential neutralizing epitopes on the more conserved S2 domain may provide broader protection. We report three antibodies binding epitopes conserved on the pre-fusion MERS, SARS-1 and SARS-2 spike S2 domains. Antibody 3A3 binds a conformational epitope with ~2.5 nM affinitydoi:10.1101/2021.01.31.428824 fatcat:3rmbticxzjaz7bsbyowhonatsq