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Steps downstream of pFCC of chlorophyll breakdown in leaves of the Arabidopsis mes16 mutant. They lead either to formyloxobilin-type CCs or to dioxobilin-type CCs (represented in the Figure by structures in the upper or lower part, respectively). Structures of hydroxymethylated CCs 4, 5 and 7 of the mes16 mutant and of their newly introduced hydroxymethyl groups are highlighted.
