Panichareon et al. [6] noted a linkage disequilibrium (albeit a moderate one) between SNP’s in CTXN3 and SLC12A2; both these genes are within the 5q23 region that has been identified as a “locus of vulnerability” or a “candidate region” with respect to genetic risk of schizophrenia [9-11]. Here, SLC12A2 is linked to schizophrenia.