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The complete model of a core hexamer. The selected model of APC hexamer containing ApcC and REP domain. A, REP (blue cartoon) interacts with ApcC (red cartoon) and is in close proximity to some of the chromophores (blue sticks). B–D, the same hexamer as in A contains the minor core components ApcD (magenta cartoon) and ApcF-ApcE(1–240) (brown cartoon) with the P502-loop (orange) in three 90° vantage points.
