Figure 1. Frequency of the gly allele of the dopamine D₃ receptor (DRD3) ser9gly polymorphism in eight samples of different ethnic origin, vhich were included in a pooled meta-analysis in which association of the DRD3 ser9gly polymorphism with susceptibility to tardive dyskinesia (TD) was examined.⁶ The samples from Bonn (n=240), Milan (n=93), Newcastle (n=69), Nithsdale (n=100), and Vienna (n=61 ) were all made up of Caucasians. The Jerusalem sample (n=113) was made up of subjects of Jewish Ashkenazi (n=66) or non-Ashkenazi (n=47) origin. There was no difference in gly allele frequency between the Ashkenazi and non-Ashkenazi subjects. US-Cauc, Caucasian subjects recruited in the US (n=81); US-AA, US African-Americans (n=23).