Mitigation of off-target toxicity in CRISPR-Cas9 screens for essential non-coding elements oleh Josh Tycko, Michael Wainberg, Georgi K. Marinov, Oana Ursu, Gaelen T. Hess, Braeden K. Ego, Aradhana, Amy Li, Alisa Truong, Alexandro E. Trevino, Kaitlyn Spees, David Yao, Irene M. Kaplow, Peyton G. Greenside, David W. Morgens, Douglas H. Phanstiel, Michael P. Snyder, Lacramioara Bintu, William J. Greenleaf, Anshul Kundaje, Michael C. Bassik