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Indeed there's little doubt that violence is the result of an uneasy mix between bad genes and a bad environment. How much control nature has over nurture, however, is the question. Previous studies of the MAO-A gene suggest that interplay may begin in early childhood. A British study of 442 New Zealand men, published in 2003, was among the first to find that those with a low-active MAO-A gene, who had been abused as children, were four times more likely to have committed rapes, robberies and assaults than the general population. Those with high-active MAO-A genes, moreover, appeared to be immune to childhood mistreatment, turning out to be no more or less violent than average. Men with low-active genes who were not the victims of child abuse were slightly less antisocial than average.
"What all these risk gene studies show us is that genes do an important job in loading the gun," says Joshua Buckholtz, a neuroscience Ph.D. candidate at Vanderbilt University's Brain Institute and Department of Psychology, who has written extensively about MAO-A gene. "But it's the environment that pulls the trigger."

A. 어휘
uneasy 불쾌한, 불안한, 거북한. mix 혼합. nature 先天性(선천성).
nurture 후천성, 양육. previous studies 以前(이전)의 연구.
interplay 相互作用(상호작용), 交叉(교차). low-active 低(저) 활동적.
abuse 학대하다. commit 犯(범)하다 .rape 강간. robbery 강도행위. assault 폭행.
immune 면역성이 있는, 抗體(항체)가 있는. mistreatment 학대. average 평균.
victim 희생자. slightly 약간, 輕微(경미)하게. risk gene 위험유전자.
load 총포에 탄약을 裝塡(장전)하다. neuroscience 신경과학.
Ph.D. 박사. candidate 지원자, 지망자, 후보. Brain Institute 뇌 연구소.
department 課(과), 部(부). extensively 광범위하게. trigger 방아쇠.