USP7 and schizophrenia: Fifteen genes, ALKBH4 [24], BCR [25], CD160 [26], DAZ3 [24], GJA5 [24], [25], IL9R [24], KIF13A [26], MGLL [25], NLGN4Y [24], PRKY [24], RGS12 [26], SCHIP1 [25], USP7 [25], VCY [24] and ZNF140 [25], are subject to copy number variation in individuals with schizophrenia.