Fig. 6. Immunolocalization of the 5-HT2C receptor and Veli3 in the anterior olfactory nucleus and the choroid plexus. Light microscope observations (A–D) indicated similar distribution patterns for both 5-HT2C receptor and Veli3 immunostainings in the anterior olfactory nucleus (A and B) and the choroid plexus (C and D). Electron microscope observations (E–H) demonstrated that electron-dense precipitates corresponding to immunostainings for both antibodies were associated with the same subcellular structures, i.e. (i) post-synaptic (arrows) and, to a lesser extent, presynaptic (arrowheads) thickenings of axo-dendritic synapses in the olfactory nucleus (E and F); and (ii) the membrane of distal portions of microvilli in choroidal cells (G and H). D, dendritic profile; ax, axonal profile. Scale bars (A–D) = 50 µm, (E–H) = 1 µm.