In American (AMR) population, Brazilians constituted four studies [28, 64–66] determining rs4704559 (HOMER1), rs2298383 (ADORA2A), rs1800497 (ANKK1) associated with dyskinesia, rs3761422 (ADORA2A) with motor fluctuation and rs28363170 (DAT1) with hallucination. The gene discussed is ANKK1; the disease is drug-induced dyskinesia.