Western blot analyses of p-Tau levels were conducted using antibodies to detect phosphorylation of GSK-3β at Y216. Blots are from representative experiments, while the graph is a summary of quantitation of protein levels normalized against total GSK-3β [nonphosphorylated form] in samples, from striata of 17 PD cases, 18 with PDD and 22 controls and IFG from 9 PD cases, 7 PDD and 9 controls. * denotes p<0.01 for PD and PDD groups compared to controls, while † denotes p<0.01 for PDD compared to PD.