Two separate teams, one Swedish and one Chinese, are working on editing human DNA.

The teams are experimenting on human embryos developed through in vitro fertilization.

Editing comprises of zeroing in on individual human genes, affecting very precise change to the DNA. A gene-editing tool that has recently been developed is described as a “game-changer,” allowing this process to become quicker, cheaper, and more accurate.

By modifying and observing, scientists try to determine gene fun...

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