Although there are a large number of different types of GABAergic interneurons in the brain [66,67,68], with a variety of associated characteristics [69], a considerable body of the schizophrenia research literature has tended to focus on the subset of inhibitory interneurons that are found throughout the brain and express the protein parvalbumin (PV) [70,71]. Here, PVALB is linked to schizophrenia.