Scientists create first genetically modifed human embryos

While scientists often experiment with human adult cells and animal embryos, it's the first time a team has openly discussed working with human embryos. Sun Yat-Sen University researchers said they tried to eradicate the genes for a blood disorder called Beta Thalassemia in embryos that would have otherwise been discarded, according to their Protein & Cell journal article, published April 18. Using 86 embryos with extra sets of chromosomes that had been created for in vitro fertilization, the scientists in Guangzhou cut into DNA and either replaced or rewrote problematic genetic sequences.
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