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Structures of Bo-NCC-1 (1), Bo-NCC-2 (2), and Bo-DNCC (3), the major Chl-catabolites in senescent broccoli, and possible pathways of their formation from pFCC (a, methylesterase; b, deformylating cytochrome). The hypothetical nonenzymatic isomerization of FCCs and of DFCC to NCCs and to DNCC, respectively, is presumed to take place in the vacuole (see Figure 7).
