AIF1 and Parkinson disease: A significant increase was found in total Iba1 density in the SN of PD patients relative to controls (Figure 6a, c; Figure 7a; PD vs Ctr p = 0.03; Ctr Mean = 6.0 ± 0.6; PD Mean = 7.7 ± 0.5), but not in iLBD cases compared to controls.