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(a) Stereoview of the structure of MERS-CoV 3CLpro protomer C (crystal form III, magenta ribbons) superimposed on the structure of IBV-CoV 3CLpro protomer C (PDB entry 2q6d, red ribbons; Xue et al., 2008 ▶). (b) Stereoview of the structure of MERS-CoV 3CLpro protomer C (crystal form III, magenta ribbons) superimposed on the structure of the SARS-CoV 3CLpro G11A monomer (PDB entry 2pwx, cyan ribbons; Chen et al., 2008 ▶).
