Genetically-modified humans: what is CRISPR and how does it work?

Targeted, genetic modification in humans is no longer in the realm of science fiction. Both the UK and US governments have approved the use of a cheap and accurate DNA-editing technique called CRISPR-Cas9 in human embryos and adults. The technique allows scientists to edit genes with unprecedented precision, efficiency, and flexibility – but how does it work and why is it so controversial?

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