RAB38 and Alzheimer disease: Similarly, the lead colocalized SNP rs1691364 for the triplet RAB38–excitatory–neurons–FTD (PP.H4 = 0.81) showed a preference for the interaction model (LRT, P = 1.10 × 10−3) with interaction effects from PD and AD samples (PDinteraction, P = 1.56 × 10−3; ADinteraction, P = 3.49 × 10−2; Figs. 4e,f).