To study the corticostriatal glutamatergic connections in PD brains, we determined SMI-32 signal in caudal WMTs and Vesicular glutamate transporter 1 (vGluT1) signal in corticostriatal terminals, at early PD (unified stages IIa and IIb [3]) and advanced PD (Braak stages 5–6 [2]). The gene discussed is SLC17A7; the disease is Parkinson disease.