Scientists have finally discovered the enzyme responsible for giving urine its yellow color. For over 125 years, it has been known that a compound called urobilin is responsible for the yellow color of urine, but the process of its creation from the red-orange bilirubin was a mystery. Now, researchers have identified the enzyme, bilirubin reductase, which is produced by gut microbes. This enzyme converts bilirubin into colorless urobilinogen, which further breaks down into yellow urobilin. The findings shed light on a previously unexplained biological phenomenon and provide insight into potential health implications related to the buildup of bilirubin in the body.
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