A, B, 5-HT1A immunoreactivity in hippocampal dendrites (CA3) of saline-treated (A) and fluoxetine-treated (B) rats. A, B, 5-HT1A immunoreactivity in hippocampal dendrites (CA3) of saline-treated (A) and fluoxetine-treated (B) rats. Note the predominance of the immunogold particles on the dendritic membrane in both cases. Scale bar: (in B) 1 μm. In the corresponding histograms, note the equal density of dendritic membrane labeling in the hippocampus (CA3) of saline controls and fluoxetine-treated rats. Data are from four rats in each group (mean ± SEM for the treated group). Mustapha Riad et al. J. Neurosci. 2004;24:5420-5426 ©2004 by Society for Neuroscience