(Molecular Cell 59, 685–697; August 20, 2015) In the original publication, the information detailing the exact composition of the D and AM halves was omitted from the Supplemental Experimental Procedures. The authors regret this error and are adding this information below. The N-terminal (D) half of Dam comprises amino acids 1–75, and the C-terminal (AM) half of Dam comprises amino acids 53–272. The nucleic acid sequences of full-length Dam, N-terminal D, and C-terminal AM are provided below and correspond to Figure 1 (underlined/green, D; italics/red, AM). Shared sequences are underlined and in bold italics/yellow.