Gene linked to drunken impulsiveness

Some people who are relatively mild-mannered most of the time can become violent after a few drinks. Researchers from the National Institute on Alcohol Abuse and Alcoholism in Maryland compared the genes of people who had acted impulsively under the influence with those whose behaviour remained more or less the same. They found that those people who had a DNA variation which blocked the action of a gene known as HTR2B were more likely to behave impulsively after they had been drinking.