 Through whole-body autoradiography it was demonstrated that the concentrations of radioactivity were highest in the kidneys, liver, fat tissues, pancreas and in the mesenteric lymph nodes, while the lowest concentrations appeared to be in the thymus, eyes, brain, testes, bone, muscles and blood.In a study of absorption, distribution, metabolism (biotransformation) and excretion of novaluron, rats received radioactively labeled novaluron orally.The absorbed novaluron was metabolized and 14 and 15 components were detected in the urine and bile respectively.