Workman, RE., Pammi, T., Nguyen, BTK., Graeff, LW., Smith, E., Sebald, SM., Stoltzfus, MJ., Euler, CW., Modell, JW., 2021, A natural single-guide RNA repurposes Cas9 to autoregulate CRISPR-Cas expression, Cell, 184(3):675-688.e19. doi: 10.1016/j.cell.2020.12.017. PMID: 33421369  PubMed