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The Omicron variants of SARS-CoV-2 have recently become the globally dominant variants of concern in the COVID-19 pandemic. At least five major Omicron sub-lineages have been characterized: BA.1, BA.2, BA.3, BA.4 and BA.5. They all possess over 30 mutations on the Spike (S) protein. Here we report the cryo-EM structures of the trimeric S proteins from the five subvariants, of which BA.4 and BA.5 share the same mutations of S protein, each in complex with the surface receptor ACE2. All threedoi:10.1101/2022.07.13.499586 fatcat:hbiebh2zdjf5bhjj3pmg3q6gze