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Vagal signaling by proteins and amino acids induces neuronal activation in the nucleus tractus solitarius (NTS). Photomicrograph of the rostral part of the NTS. Double-labeled Fos/GLP-1 neurons (brown nuclei and blue/gray cytoplasm, magnification ×20). Zoom (magnification ×40) shows 1 double-labeled neuron. 5-HT, serotonin; AP, area postrema; CCK, cholecystokinin; GLP-1, glucagon-like particle 1; PYY, peptide YY. Adapted from Reference 53 with permission.
