New era of human embryo gene editing begins
News report highlights one example, but scientists say many experiments now going on
![human embryo](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/09/092316_ti_embryo_cells_feat_free.jpg?fit=840%2C540&ssl=1)
EDITS UNDER WAY Researchers in Sweden have begun editing genes in viable early human embryos (four-cell stage, shown). Others are probably doing the experiments behind closed doors, scientists say.
NinaSes/Wikimedia Commons (CC BY-SA 4.0)