Photo micrograph of a pyramidal neuron in the olfactory cortex labeled with tracer biocytin. Patch-clamp recording of evoked glutamatergic synaptic currents (red) and application of selective ionotropic receptor antagonist GYKI which selectively blocks AMPA-receptor mediated currents (yellow).

Http://www.uwyo.edu/neuron/sunlab.htm.

Credit: Andrew Young