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Worldwide diversity of alleles of D4 receptor gene (DRD4), linked to attention deficit hyperactivity disorder (ADHD), is mostly the result of length and single nucleotide polymorphisms in a 48-bp tandem repeat (VNTR). Alleles containing from two (2R) to eleven (11R) repeats have been identified. The most common are 4R, 7R and 2R.

revista médica de chile

Variación de alelos del gen receptor de dopamina DRD4 en escolares chilenos de diferente origen étnico y su relación con riesgo de déficit atencional/hiperactividad