Fig. 2: A WGA-HRP labeled LGN M/P axon within layer IVC of a squirrel monkey. The WGA-HRP electron-dense reaction product is indicated by an arrow. Note that the spine (indicated as sp) postsynaptic to this axon terminal contains silver grains (seen as larger black dots) indicative of the presence of mGluR5 (arrowheads) but the axon itself does not. Other dendrites nearby also show evidence of mGluR5 labeling. Scale bar - 5µm.