OXTR and autism: Kelemenova et al. (2010), using a sample of autistic boys in Slovakia, also focused their research on several candidate gene polymorphisms associated with autism, specifically OXT (rs2740204), OXTR (rs2228485), GABA receptor gamma 3 (rs28431127), neuroligin (rs5916338), and reelin. The authors found only one significant association: between autism and a higher number of GGC repeats in the (GGC)n STR polymorphism of the reelin gene, in addition to finding lower reelin levels in the blood and the brain of autistic patients.