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coloring matter in the bile derived from porphyrins by rupture of a methane bridge; for example, bilirubin, biliverdin.
a group of substances that contribute to the colors of bile, which may range from a yellowish green to brown. A common bile pigment is bilirubin, which contains a reddish iron pigment derived from the breakdown of old red blood cells.
bile pig·ments(bīl pig'mĕnts)
Coloring matter in the bile derived from porphyrins by rupture of a methane bridge (e.g., bilirubin, biliverdin).