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Cartoon representation of the HCoV-OC43 spike protein (PDB code:6NZK) S1Bdomain (green). The strands β4 (orange) and β5 (cyan) and the extended loop (pink) are indicated. The Cys-Cys pairs; 591–597, 491–561, 535–548, 571–578, 535–548, 499–522, 501–576 form disulfide bridges (yellow).
