Striatal neurokinin-1 receptors (NK1R, A&D) are expressed by cholinergic (ChAT, B) and somatostatin (SOM, E) interneurons. Striatal sections were processed for immunofluorescence with antibodies against the neurokinin-1 receptor (FITC, green) and choline acetyltransferase (ChAT) or somatostatin (Cy3, red). Overlay of the images shows the expression of the striatal neurokinin-1 receptor within these two subpopulations of interneuron (C&F). Photomicrographs were obtained with the confocal microscope. Space bar: 100 µm. (n = 6)