Phylloxanthobilins are Abundant Linear Tetrapyrroles from Chlorophyll Breakdown with Activities Against Cancer Cells

The major chlorophyll catabolites are colorless phyllobilins with four deconjugated pyrrole units. Their yellow oxidation products, are getting more and more in the spotlight due to their interesting physicochemical properties and potential bioactivities. Although studies on physiologically relevant activities of phyllobilins are in early stages, it already becomes evident that when it comes to bioactivities, yellow beats colorless