Fig. 4From: Regional differences in serotonin content in the nucleus of the solitary tract of male rats after hypovolemia produced by polyethylene glycol5-HT fiber labeling in the NTS. High magnification digital micrograph of 5-HT labeling in the cNTS of a rat treated with PEG illustrating ‘beaded’ appearance of fibers. Inset ‘digital close-up’ showing the varicosities of the fibers in the area indicated by the box. Scale bar 20 μmBack to article page