gender difference in the ability to suppress hunger in relation to this SNP, which may contribute to the greater incidence of obesity in women compared to men. However, authors have pointed out that A1 carriers have difficulty in learning from negative feedback in a reinforcement-learning task and are less efficient at learning to avoid actions that have negative consequences. References External links For more related information on the SNP: SNPedia Dopamine receptor D2; DRD2: OMNI Entry The Human Gene Compendium DRD2: GeneCards Signal transduction Protein kinases