Samples for the study were dissected from either the left or right hemisphere of fresh frozen coronal slabs cut and frozen and stored at −80 °C. Brodmann areas 9 and 46 on the dorsolateral surface of the prefrontal cortex were dissected from the frozen slabs under the direction of a neuropathologist. The samples were shipped on dry ice to ISMMS as homogenized tissue in Trizol for RNA extraction.
