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Extended Data Fig. 1 | Purif ication of the SARS-CoV-2 RBD–ACE2 complex. a, Gel filtration chromatography of the complex. 1, SARS-CoV-2 RBD dimer–ACE2; 2,
SARS-CoV-2 RBD monomer–ACE2; 3, SARS-CoV-2 RBD monomer. b, SDS–PAGE gel of the complex.