No feedback control for creatinine.
D003404:Creatinine / Q000097:blood / Q000378:metabolism* / Q000652:urine; D005246:Feedback; D006801:Humans; D007674:Kidney Diseases / Q000652:urine; D010725:Phosphocreatine / Q000378:metabolism
D010725:Phosphocreatine; D003404:Creatinine