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Ribbon diagram of the catalytic trimer of Escherichia coli ATCase, E. coli OTCase, Enterococus faecalis PTCase, Xanthomonas campestris AOTCase, Bacteroides fragilis SOTCase and E. coli YTCase, viewed down the three-fold axis. Different subunits are shown in different colors (rainbow, green and magenta, respectively). The bound substrates or inhibitors are shown as space-filling models.
