Even CRISPR

A FEW years ago, molecular biologists made a breakthrough. By borrowing an antiviral mechanism called CRISPR-Cas9 from bacteria, they created an easy way to tweak the genetic information in a cell's nucleus. This has implications for medicine and agriculture. Unfortunately, a dispute over who invented what parts of the technique first has threatened to curtail this potential. But that may not matter, for CRISPR-Cas9 turns out not to be the only way bacteria protect themselves from the attentions...