In both Gunn rats and UGT−/− mice, cerebellar damage took at least 7–9 days to become significant and was not detectable at early post-natal ages, despite the presence of hyperbilirubinemia early after birth34, 36, 40, 41, 42, 43, 44. The gene discussed is SLC35A2; the disease is Hyperbilirubinemia.