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The holiday celebrates the end of slavery in the United States. The annual celebration in Las Vegas will be held this weekend at Lorenzi Park. Festival Organizer Diane Pollard explains the significance of the celebration.

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The human version of a DNA sequence called HARE5 (inserted into this mouse embryo) turned on a gene that's important for brain development. (Gene activity is stained blue.) By the end of gestation, the embryo's brain was 12 percent larger than the brain of an embryo injected with the chimpanzee version of HARE5.
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