The final study sample consisted of 14 PD brains [n = 9 (64%) with MAPT H1/H1, n = 5 (36%) with H2/H2] and 12 controls [n = 7 (58%) with MAPT H1/H1, n = 5 (42%) with H2/H2) (Fig. 1, Table 2). This evidence concerns the gene MAPT and Parkinson disease.