The early bilirubin.
D000818:Animals; D001663:Bilirubin / Q000096:biosynthesis*; D002247:Carbon Isotopes; D004920:Erythropoiesis / Q000502:physiology*; D007982:Levulinic Acids / Q000175:diagnosis; D051381:Rats
D002247:Carbon Isotopes; D007982:Levulinic Acids; D001663:Bilirubin