We measured expression of two dendritic spine mRNAs in the TRC collection, but failed to observe any altered transcript levels in patients with schizophrenia relative to controls for PPP1R9B (U = 609.00, p = 0.529) or DLG4 (t(71) = −1.139, p = 0.258). This evidence concerns the gene PPP1R9B and schizophrenia.