Men with gene variations linked to aggression are more likely to join a gang.rnAbout one-third of men have the low-activity version of the gene MAOA. This has previously been shown to increase aggression in men who were abused as children.rnKevin Beaver, a criminologist at Florida State University in Tallahassee, and colleagues looked at the version of MAOA present in about 2000 people, and asked about their involvement with gangs.
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