Gotta go? We've finally found out what makes urine yellow
Briefly

"Though it was previously thought that multiple enzymes were involved in the reduction of bilirubin, our results support the finding that a single enzyme performs the reduction of bilirubin to urobilinogen," the research team said.
"While urobilin previously had an association with the color of urine, the enzyme that starts the process by producing urobilinogen was unknown until now," the researchers explained.
Read at Ars Technica
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