Neonatal bilirubin metabolism (Contd.) 3. Defective bilirubin conjugation a Decreased uridine diphosphate glucuronyl transferase(UDPG-T)activity 葡萄糖醛酸转移酶 b Increased uridine diphosphoglucose dehydrogenenase(B-glucuronidase)activityNeonatal bilirubin metabolism (Contd.) 3. Defective bilirubin conjugation a. Decreased uridine diphosphate glucuronyl transferase (UDPG-T) activity 葡萄糖醛酸转移酶 b. Increased uridine diphosphoglucose dehydrogenenase (-glucuronidase) activity