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Electron micrograph of DAB-labeled IX terminals in the dorsal zone of the NTS of a sodium-restricted rat. Three closely apposed, labeled terminals (t1*, t2*, t3*) were densely filled with synaptic vesicles. One terminal (t1*) formed a synapse (arrow) on a dendrite (d). Another terminal (t2*) formed a synapse on spine (s). Scale bar = 0.5 μm.
