TH and Parkinson disease: The measurement of TH immunofluorescent intensity in nigral neurons was 2.0–2.1 times higher in Parkinson’s disease with combined nigral and putamenal CERE120 delivery than Parkinson’s disease with non-gene delivery, while the levels of TH immunofluorescence intensity in Parkinson’s disease with putamenal CERE120 delivery only was similar to the Parkinson’s disease with non-gene delivery (Fig. 6N).