IL-6 had little effect on the formation of dentritic spine. (a) Cultured CGCss were infected with IL-6 or control vector, and then stained with Vybrant-DiI to outline the shape of dendritic spines. Arrowheads show the mature spines of mushroom-type. (b) The histogram shows the density of mature spines per 50 μm dendrite in CGCs transfected with IL-6 (n = 10 neurons) or control vector (n = 8 neurons). The data are the mean ± SEM. Scale bars, 5 μm.