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Cryo-EM structure of infectious bronchitis coronavirus spike protein reveals structural and functional evolution of coronavirus spike proteins

Fig 5

Quaternary packing of S1 from four coronavirus genera.

(A)-(D) Structures of trimeric S1 from different genera. Three S1 subunits are colored differently. The PDB IDs are the same as those in Fig 3. All structures are viewed from the side.

Fig 5