bacterial enzyme bilirubin reductase. Urobilinogen that remains in the colon can either be reduced to stercobilinogen and finally oxidized to stercobilin, or it can be directly reduced to stercobilin. Stercobilin is responsible for the brown color of human feces. Stercobilin is then excreted in the feces.

Role in disease

Obstructive jaundice

In obstructive jaundice, no bilirubin reaches the small intestine, meaning that there is

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