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PE crystal structure. (A) 2Fo-Fc electron density map (1.0σ) of the methylated Asn72β in the structure of PE. (B) 2Fo-Fc electron density maps contoured at 1.0σ of one of the five PEB chromophores found in the structure of PE. (C) (αβ)3 hexamer shown from the upper view and the lateral view (D). Electron density of the central cavity is shown in panel E. This segment of electron density should contain information on the location of the γ subunit.
