Radovčić, M., Killelea, T., Savitskaya, E., Wettstein, L., Bolt, E. L., & Ivančić-Baće, I. (2018). CRISPR-Cas adaptation in Escherichia coli requires RecBCD helicase but not nuclease activity, is independent of homologous recombination, and is antagonized by 5' ssDNA exonucleases. Nucleic Acids Research, 46(19), 10173-10183. https://doi.org/10.1093/nar/gky799