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The global scientific community is reeling after a Chinese scientist announced that he used a powerful new gene-editing technique on twin girls to protect them from the HIV their father is carrying – an experiment that many believe was unauthorized and unethical.
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![embryo puzzle](http://www.womenofgrace.com/blog/wp-content/uploads/2017/07/embryo-puzzle.jpg)
Researchers in Portland, Oregon have become the first to create genetically modified human embryos in the laboratory using a controversial technique designed to remove disease-causing genes.
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