You may have heard of the gene-editing technique CRISPR-cas9, often simply called CRISPR. Introduced in 2012, CRISPR works like a pair of scissors to cut DNA, inserting or reordering bits of genetic code with remarkable, science-fiction-like results: CRISPR can help create mosquitoes that don’t transmit malaria, or be used to breed unusually muscular beagles, or even create mini pigs. In humans, the technology is being tested to battle cancer — by removing patients’ immune cells, editing them, and reinserting the weaponized cells into the body to hunt cancer.
