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Indirect and Direct Bilirubin: Origins, Properties and Metabolism

Red blood cells
Red blood cells (RBCs)

Bilirubin is an organic compound, which is also a powerful colorant. Bilirubin causes bile to have its characteristic greenish-yellow color. Its excessive accumulation in body tissues is the main cause of jaundice. Bilirubin is constantly being generated as a byproduct of red blood cells (RBC) renewal. This is an ongoing physiological process.

Bilirubin is excreted from the body in bile.