Synaptic proteins (Chromogranin A (CgA), Neurogranin): CgA is significantly higher in DLB patients than in controls, PD and PDD patients [55], but further research is needed for comparison with AD patients; the level of neurogranin in the CSF of AD patients is significantly higher than that in DLB patients [53]. This evidence concerns the gene NRGN and Alzheimer disease.