whereas those with two 4-repeat alleles are not. This may provide opportunities to enhance universal, community-based interventions by making special efforts to recruit those most likely to show the greatest response. Likewise, the current results suggest that caregivers of some youth with 7-repeat alleles may be less likely to change their parenting styles if they also carry the 7-repeat allele of DRD4. If so, this may constitute an important opportunity to enhance treatment for a subgroup that is particularly likely to show positive effects: parent-child dyads concordant for the 7-repeat allele.
