GPR88 and Behcet disease: 2009; Williams et al. 2011), here we report the results of a genetic association study of GPR88 for BD and SZ. We have conducted this association study using nine DNA markers covering the sequence of GPR88 in nuclear families formed by a proband with BD and both parents (triads) originating from the Sardinian population and from the Palestinian population, as well as in a sample of SZ triads recruited in the Xhosa population from South Africa.