The structure of the KlcA and ArdB proteins show a novel fold and antirestriction activity against Type I DNA restriction systems in vivo but not in vitro. - Serfiotis-Mitsa, Dimitra; Herbert, Andrew P.; Roberts, Gareth A.; Soares, Dinesh C.; White, John H.; Blakely, Garry W.; Uhrin, Dusan; Dryden, David T.F. (Biological Magnetic Resonance Bank, 2010)