| 摘 要： | Humans took a genetic leap away from the apes more than 2 million years ago, an international team of researchers announced in theProceedings of the NationalAcademy of Sciences.Using ancient fossils and advanced molecular techniques, the researchers determined that the gene mutation (变化,转变), when a gene fell out of the human genetic code (遗传密码), probably occurred 2. 5 to 3 million years ago. It was after humans stood upright (直立) - about 6 to 7 million years ago - but before hominid(原始人类) brains
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