GRIN2B and schizophrenia: When comparing groups of patients with early age of onset of schizophrenia and adult age of onset of the disease, we found an association of the rs7206256 (p = 0.043 for genotypes, p = 0.020 for alleles) and rs11644461 (p = 0.034 for genotypes, p = 0.030 for alleles) polymorphisms of the GRIN2A gene (Table 2) and the rs7313149 polymorphism of the GRIN2B gene (p = 0.048 for alleles) (Table 3) with the early onset of schizophrenia.