1ZYO:
reference: Crystal structure of the serine protease domain of Sesbania mosaic virus polyprotein and mutational analysis of residues forming the S1-binding pocket., Gayathri P, Satheshkumar PS, Prasad K, Nair S, Savithri HS, Murthy MR, Virology. 2006 Mar 15;346(2):440-51. Epub 2005 Dec 13. PMID: 16356524

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