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Outline of chlorophyll breakdown in senescent plants. The chlorophylls a (R=CH3, Phy=phytyl) and b (R=CH=O, Phy=phytyl) are degraded by the primary “fluorescent” chlorophyll catabolite (pFCC) to “nonfluorescent” chlorophyll catabolites (NCCs, in which, typically, the residues R1, R2, and R3 vary).[4,5]
