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Biosynthesis of bilins. A common tetrapyrrole pathway gives rise to both heme and chlorophyll (top). Breakdown of heme proceeds via action of a heme oxygenase (HO) and a ferredoxin-dependent bilin reductase (FDBR). Different FDBRs carry out the same reaction (reduction) on different parts of the tetrapyrrole (bottom). This difference in regiospecificities allows production of a range of bilins with different spectral properties from a single precursor.
