An enhanced CRISPR repressor for targeted mammalian gene regulation by Yeo, NC, Chavez, A, Lance-Byrne, A, Chan, Y, Menn, D, Milanova, D, Kuo, C-C, Guo, X, Sharma, S, Tung, A, Cecchi, RJ, Tuttle, M, Pradhan, S, Lim, ET, Davidsohn, N, Ebrahimkhani, MR, Collins, JJ, Lewis, NE, Kiani, S, Church, GM