Another study focused on glutamate ionotropic receptor AMPA type subunit 2 (GluR‐2) RNA editing, which affects calcium permeability in neurons, revealing that in the prefrontal cortex of Alzheimer's and schizophrenia patients, approximately 1.0% of GluR‐2 RNA remained unedited compared to less than 0.1% in controls. This evidence concerns the gene GRIA2 and schizophrenia.