M.L. Hochstrasser, D.W. Taylor, P. Bhat, C.K. Guegler, S.H. Sternberg, E. Nogales, J.A. Doudna. (2014) CasA mediates Cas3-catalyzed target degradation during CRISPR RNA-guided interference. Proc. Nat. Acad. Sci111(18)6618-23.