Urine is a critical diagnostic tool, revealing a wide range of disorders, yet scientists have just now unraveled one of its mysteries - how the bodily fluid turns yellow.A team of scientists from the University of and the US National Institutes of Health discovered the hue stems from a molecule made from bacteria in our digestive system.It's an enzyme called bilirubin reductase (BilR), and it was the missing piece of the century-and-a-half-old puzzle explaining why urine is yellow.
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