Evolutionary classification of CRISPR-Cas systems: a burst of class 2 and derived variants.
Alexander F Yakunin, Eugene V Koonin, Rodolphe Barrangou, John van der Oost, Rolf Backofen, Roger A Garrett, Feng Zhang, Winston Yan, Malcolm F White, Česlovas Venclovas, Michael P Terns, Virginijus Siksnys, Shiraz A Shah, David Scott, Francisco J M Mojica, Sylvain Moineau, Philippe Horvath, Daniel H Haft, Kira S Makarova, David Cheng, Emmanuelle Charpentier, Stan J J Brouns, Omer S Alkhnbashi, Sergey A Shmakov, Jaime Iranzo, Yuri I Wolf
Nature reviews. Microbiology 2020;18(2):67-83