A genetic tweak can make cells self-destruct in the presence of CRISPR and could be used to shut down cell therapies if they go rogue.

CRISPR gene editing can be used to efficiently and easily introduce changes to the DNA of living cells. It is a useful technique, but it would be handy to be able to make some cells CRISPR-resistant. For example, there is interest in storing information in DNA inside cells , and rendering some of these uneditable by …