Mao C-Z, Zheng L, Zhou Y-M, Wu H-Y, Xia J-B, Liang C-Q, Guo X-F, Peng W-T, Zhao H, Bin Cai W-, et al. CRISPR/Cas9-mediated efficient and precise targeted integration of donor DNA harboring double cleavage sites in Xenopus tropicalis. FASEB J. 2018:fj201800093.