3ZFT:
reference: Crystal Structures of the Viral Protease Npro Imply Distinct Roles for the Catalytic Water in Catalysis., Zogg T, Sponring M, Schindler S, Koll M, Schneider R, Brandstetter H, Auer B, Structure. 2013 Apr 30. pii: S0969-2126(13)00112-3. doi:, 10.1016/j.str.2013.04.003. PMID: 23643950

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