In June 2008, a team of Swedish researchers released the largest study to date of genetic differences in the human brain. They found that 1,349 genes are expressed differently in the brains of men compared with women. They also studied macaques, a kind of monkey in which researchers have noticed some differences in how males and females (just as there are some differences in how human females and males behave); and they studied marmosets, a kind of monkey in which the males and females do NOT behave differently as a rule. In macaques, they found that 486 genes are expressed differently in the brains of females compared with males; while in marmosets, only seven genes are expressed differently in the brains of females compared with males.
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