Location of 26 neurons. Neurons with significant reductions (range: 29–100% suppression) following Y1 agonist (solid red), significant reductions (range: 22–100%) following Y2 agonist (solid blue), nonsignificant changes (range: 0–3%) to Y1 agonist (open red), nonsignificant changes (range: (0–3%) to Y2 agonist (open blue). Gi, nucleus gigantocellularis; IRt, intermediate subdivision of the reticular formation; mXII, hypoglossal nucleus; PCRt, parvocellular reticular formation; rNST, rostral nucleus of the solitary tract.