Hallet, B., ARCISZEWSKA, L. K., & SHERRATT, D. J. (1999). Reciprocal control of catalysis by the tyrosine recombinases XerC and XerD : an enzymatic switch in site-specific recombination. Molecular Cell, 4(6), 949-959. https://doi.org/10.1016/S1097-2765(00)80224-5 (Original work published 1999)