No significant difference was observed in the volume of α-synuclein positive H(3) = 2.089, p = 0.554, or α-synuclein negative H(3) = 0.803, p = 0.749 serotonergic synapses between groups (Fig. 3H, J, L), or when comparing directly between DLB groups (α-synuclein positive: p = 0.583; α-synuclein negative: p = 0.667, Mann-Whitney U). This evidence concerns the gene SNCA and Lewy body dementia.