1. A greenish bile pigment that is an intermediate product of the breakdown of hemoglobin in the liver and in turn breaks down to produce bilirubin (pigment produced when the liver processes waste products).
2. A green pigment found in bile which is formed during haem catabolism (when organisms convert substances into excreted compounds), mainly the breaking down of old red blood cells, within the liver.

It transforms into the red-orange bile pigment bilirubin. A high bilirubin level causes yellowing of the skin.