PVALB and schizophrenia: Although more than 20 different classes of GABAergic interneurons exist (DeFelipe et al. 2013), it has been suggested that in schizophrenia there is a loss of a particular type of GABAergic interneurons characterised by containing the calcium-binding protein parvalbumin (PV) (Beasley and Reynolds 1997; Chung et al. 2016a; Enwright Iii et al. 2017; Lisman et al. 2008; Lodge and Grace 2008; Perez and Lodge 2013).