In San Francisco, the gene-editing tool CRISPR-Cas9 is raising ethical questions. By carefully editing DNA, it is being used to explore possible cures for genetic diseases, but there are also concerns about how it could affect the course of evolution. Find out more with Future Proof: http://reut.rs/2fNEk8H | Reuters

The CRISPR-Cas9 system has fundamentally changed the way scientists can edit genes. From turning gene expression on and off to fluorescently tagging particular sequences, this Animation explores some of the exciting possibilities of CRISPR. Access the Collection on Expanding the CRISPR Toolbox: http://go.nature.com/2gT0GpS | Nature Portfolio