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- First Discovery Of 'Animals-Only' Pigment Bilirubin In Plants. Mar.
- 23, 2009 — In a first-of-its-kind discovery that overturns conventional wisdom, scientists in Florida are reporting that certain plants — including the exotic "White Bird of Paradise Tree" — make bilirubin.
- Until now, scientists thought that pigment existed only in animals.
- The finding may change scientific understanding of how the ability to make bilirubin evolved, researchers say.
- In the new study, Cary Pirone and colleagues note that bilirubin is a brownish yellow substance resulting from the liver's breakdown of hemoglobin, the red pigment that carries oxygen in the blood.
- Parents know bilirubin as the stuff that discolors the skin of newborns with neonatal jaundice, sometimes requiring phototherapy, treatment with light.
- Bilirubin also gives a yellowish tinge to the skin of patients with jaundice resulting from liver disease.
- Until now, scientists never dreamed that plants, as well as animals, produce bilirubin.
- The researchers used two powerful laboratory techniques, liquid chromatography and nuclear magnetic resonance, to detect bilirubin in fruit of the white bird of paradise tree.
- The fruits contain unusual, orange-colored, furry seeds, and bilirubin turns out to be the coloring agent.
- They also found the pigment in two closely related plant species.
- The discovery may stir evolutionary research to understand why and how plants make what everyone regarded as an animals-only pigment, they suggest.
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