Betalains are bright red and yellow pigments, which are produced in only one order of plants, the Caryophyllales, and replace the more familiar anthocyanin pigments. The evolutionary origin of betalain production is a mystery, but a new study has identified the first regulator of betalain production and discovered a previously unknown link between the two pigment pathways.
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Davies, K. Swapping one red pigment for another. Nat Genet 47, 5–6 (2015). https://doi.org/10.1038/ng.3174
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