Accumulation of synaptic proteins in MAP1B-deficient neurons. (A) Representative western blot of Tiam1, Rac1, PSD95 and MAP1B levels from total homogenates and synaptosomal fraction from wild-type and MAP1B+/− mouse brain. (B) Quantification of Tiam1, Rac1, PSD95 and MAP1B levels, normalized to wild-type levels, from experiments as the one shown in (A).