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CN-independent and CN-dependent routes of BR biosynthesis. The CN-independent pathway, via CR → 22-OHCR → 22-OH-4-en-3-one → 22-OH-3-one → 3-epi-6-deoxoCT → 6-deoxoTY → 6-deoxoCS → CS → BL, is two reactions shorter than the CN-dependent route, due to shortcutting the 3-one → CN and 6-deoxoTE → 6-deoxo3DT reactions.
