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“The current study builds on this research and examines the association between the 2-repeat allele and shooting and stabbing behaviors in a sample of males drawn from the National Longitudinal Study of Adolescent Health. Analyses revealed that African-American males who carry the 2-repeat allele are significantly more likely than all other genotypes to engage in shooting and stabbing behaviors and to report having multiple shooting and stabbing victims” - The 2-repeat allele of the MAOA gene confers an increased risk for shooting and stabbing behaviors https://pubmed.ncbi.nlm.nih.gov/24326626/
