<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Urobilin or urochrome is the chemical primarily responsible for the yellow color of urine . It is a linear tetrapyrrole compound that, along with the related compound urobilinogen, are degradation products of the cyclic tetrapyrrole heme . </P> <P> Urobilin is generated from the degradation of heme, which is first degraded through biliverdin to bilirubin . Bilirubin is then excreted as bile, which is further degraded by microbes present in the large intestine to urobilinogen . Some of this remains in the large intestine, and its conversion to stercobilin gives feces its brown color . Some is reabsorbed into the bloodstream, where it is oxidized to urobilin and eventually excreted by the kidneys, giving urine its yellow color . </P>

What is urochrome (also known as urobilin)