Urobilin

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The structure of Urobilin
The structure of Urobilin

Urobilin is a yellow linear tetrapyrrole, resulting from the breakdown of haem, a cyclic tetrapyrrole. Urobilin is generated in intestines from bilirubin. It is absorbed into blood stream and is supposed to be degraded in liver. When there is liver failure, urobilin starts being excreted by kidneys. It then can be found in urine (which is abnormal sign, confirming jaundice), hence its name.

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