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The pathway of chl breakdown in higher plants. The chemical constitutions of chl and of chl catabolites are shown. Pyrrole rings (A–D), methine bridges (α–δ), and relevant carbon atoms are labeled. Sites of peripheral modifications as present in different NCCs are indicated (R1–R3). Abbreviations are as indicated in the text. Chlase, chlorophyllase; MCS, Mg-dechelating substance.
