RNA expression levels for GSK3β and APBB2 were obtained for the ROS/MAP from frozen sections of the dorsolateral prefrontal cortex that was manually dissected from postmortem brain tissue. Details of RNA extraction, processing and data quality control and normalization have been previously published (Lim et al. 2014 (link)). In brief, RNA was isolated using the RNeasy lipid tissue kit (Qiagen, Valencia, CA) and was reverse transcribed and biotin-UTP labeled using the llumina® TotalPrep™ RNA Amplification Kit from Ambion (Illumina, San Diego, CA). Expression signals were generated using the Beadstudio software suite (Illumina, San Diego, CA). Standard control and normalization methods were employed to account for technical variability due to differences in hybridization dates and stabilize the variance for the purpose of statistical analyses.