Interestingly, our findings in PDD/DLB relate well to data showing increased microglia proliferation in the hippocampus only in presymptomatic incidental Lewy body disease, but not in defined PD patients [33], similar to an increased toll-like receptor 2 expression in the hippocampus of incidental Lewy body disease only [56]. The gene discussed is TLR2; the disease is Lewy body dementia.