CA1 spine density is not altered in Arf4^+/− mice compared to WT mice.

<p>(<i>A</i>) Golgi impregnation of a WT hippocampus at 5X. (<i>B</i>) Representative dendrites for CA1 pyramidal neurons of WT and Arf4^+/− mice at 63X magnification. (<i>C</i>) Averaged total spine density in the CA1 region of WT and Arf4^+/− mice (28–30 neurons/genotype). (<i>D</i>) Spine densities for specific spine subtypes in the CA1 region of WT and Arf4^+/− mice.