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Chinese scientists have implanted human brain genes into monkeys, in a study intended to provide insights into the unique evolution of human intelligence. Researchers inserted human versions of MCPH1, a gene that scientists believe plays a role in the development of the human brain, into 11 rhesus monkeys.However, the monkeys did not grow bigger brains than the control group.In January, Chinese scientists unveiled five macaques cloned from a single animal that was genetically engineered to have a sleep disorder, which all developed signs of mental problems including depression, anxiety and behaviors which are linked to schizophrenia.They said the study was intended to aid research into human psychological problems.
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