In BA9 of adults with autism we observed significantly increased ratios for RAC1/β-actin (P <0.031, d = 1.32), RAC1/NSE (P <0.042, d = 1.24) and significantly reduced ratios for homer 1/β-actin (P <0.027, d = −1.37), homer 1/NSE (P <0.020, d = −1.43) (Figures 1 and 4, Table 3). Here, RAC1 is linked to autism.