VGAT in motor nuclei. A, Medulla spinalis, ventral horn in an upper cervical segment. B, Nucleus facialis. Immunoreactive nerve terminals outline motoneuron perikarya (M, arrowheads). A high proportion of the terminals contacting these perikarya are known to contain glycine, alone or in addition to GABA. VGAT-containing terminals in the neuropil (small arrowheads) are sometimes seen to contact dendrites. Asterisk, Empty blood vessel. Scale bars: A, 25 μm; B, 20 μm.