Toronto: Comparing testosterone levels of five-month-old pairs of twins, both identical and non-identical, researchers have found the hormone`s levels are governed by environmental factors, not genes."Testosterone is a key hormone for the development of male reproductive organs, and it is also associated with behavioural traits, such as sexual behaviour and aggression," said Richard E. Tremblay of Canada`s Montreal University`s research unit on children`s psycho-social maladjustment, who led the study.
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