Copyright information:Taken from "Crystallographic identification of an ordered C-terminal domain and a second nucleotide-binding site in RecA: new insights into allostery"Nucleic Acids Research 2006;34(8):2186-2195.Published online 28 Apr 2006PMCID:PMC1450331.© The Author 2006. Published by Oxford University Press. All rights reserved dATPI, dATPII, Glu261 are shown (see text). N- and C-termini, positions of Glu199 and Glu209 in L2 are also indicated. The regions preceding and succeeding L2, from the same superposition, indicating conformational changes, are shown in another orientation in the inset.