Stronger data may actually support an interaction between these genes, i.e., GRIN1A plus GRIN2B, and the interactions between abnormal genes and their resultant proteins may actually convey greater risk for schizophrenia than any single gene alone (Williams et al., 2002; Loftis and Janowsky, 2003; Qin et al., 2005; Tang et al., 2006). The gene discussed is GRIN2B; the disease is schizophrenia.