To see if the gene played a role in cocaineaddiction in humans, the researchers ran genetic tests on 670 cocaine addicts and more than 700 matched non-users.
为了确定该基因对人类的影响，研究人员对 670名吸毒者和 700多名非吸毒者进行了对比基因测试。
2
Cocaine is one of the main addiction drugs in the world. Scientists are always trying to discover why the addiction happens and find the methods to cure the cocaineaddiction.
Primates that aren't predisposed to addiction will become compulsive users of cocaine as the number of D2 receptors declines in their brains, Dr. Volkow noted.