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Polymorphisms in the dopamine receptor D4 gene (DRD4) have been widely investigated to assess their correlation with variations in animal behavior. We precisely examined polymorphisms in the extracellular region of DRD4 in 75 avian species belonging to 16 orders and detected high degrees of polymorphism at inter- and intraordinal levels. The existence of a variable number of proline repeats (2 to...
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