Figure 2. Histograms of the Estimated Mean Number of SN Pigmented Neurons in 13 Dys Patients and 13 C Subjects. The histograms on the left side include all Dys and C brains, while those on the right show Dys and C data after exclusion of all brains with immunohistochemical evidence of co-occurring pathologies. The lower part of the figure shows histograms of cell body, nuclear, and nucleolar mean volumes of pigmented neurons in the SN. The y-axis indicates mean volumetric values expressed in µm³. *p<0.01. Abbreviations: C, Control; Dys, Dystonia; SN, Substantia Nigra.