CRISPR is a technology that can be used to edit genes and, as such, will likely change the world. The essence of CRISPR is simple: it’s a way of finding a specific bit of DNA inside a cell.

CRISPR-Cas systems are prokaryotic immune systems that confer resistance to foreign genetic elements such as plasmids and phages. CRISPR-Cas systems have been exploited for targeted genome editing ...