Figure 3.

A–F, Localization of GABA-like and serotonin-like immunoreactivity within the lobula in frontal (A, C, E) and horizontal (B, D, F) views of the lobula layers. A, B, Frontal (A) and horizontal (B) three-dimensional views of the bee brain. C, D, GABA is distributed differentially among the layers in the lobula, with higher concentrations in layer 5 and in subregions of layers 1–3. E, F, Serotonergic neurons are also distributed differentially among the layers, with a high concentration of processes in layers 2 and 4, with diffuse processes in layers 5 and 6. Abbreviations are as defined in Figure 2 and Results.