An updated evolutionary classification of CRISPR-Cas systems

Kira S. Makarova, Yuri I. Wolf, Omer S. Alkhnbashi, Fabrizio Costa, Shiraz Ali Shah, Sita J. Saunders, Rodolphe Barrangou, Stan J.J. Brouns, Emmanuelle Charpentier, Daniel H. Haft, Philippe Horvath, Sylvain Moineau, Francisco J.M. Mojica, Rebecca M. Terns, Michael P. Terns, Malcolm F. White, Alexander F. Yakunin, Roger Antony Garrett, John van der Oost, Rolf BackofenEugene V. Koonin