Although our meta-analysis of parvalbumin mRNA in the pre-frontal cortex found a non-significant reduction, a recent large micro-array study of parvalbumin mRNA per parvalbumin-containing neuron in layer three of the dorsolateral pre-frontal cortex found a significant reduction of 22.2% in patients with schizophrenia (Enwright Iii et al. 2017), although it should be noted that this study contains sample overlap with a number of the group’s other studies in frontal regions (see “Materials and methods”), including Volk et al. (2016a) which is included in our PV mRNA meta-analysis. The gene discussed is PVALB; the disease is schizophrenia.