Urochromes: There are several different pigments, derived primarily from hemoglobin, the red pigment in your blood. Many of them are actually metabolites of the brown pigments in the feces, which in turn come mostly from the bilirubin in bile which is mostly broken down heme rings from hemoglobin.
Answered 3/19/2012
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Pigments: Pigments called urobilens.
Answered 4/4/2012
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