3GZF:
reference: Structure of the C-terminal domain of nsp4 from feline coronavirus., Manolaridis I, Wojdyla JA, Panjikar S, Snijder EJ, Gorbalenya AE, Berglind H, Nordlund P, Coutard B, Tucker PA, Acta Crystallogr D Biol Crystallogr. 2009 Aug;65(Pt 8):839-46. Epub 2009, Jul 17. PMID: 19622868

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