1LX8:
reference: Regulation of directionality in bacteriophage lambda site-specific recombination: structure of the Xis protein., Sam MD, Papagiannis CV, Connolly KM, Corselli L, Iwahara J, Lee J, Phillips M, Wojciak JM, Johnson RC, Clubb RT, J Mol Biol 2002 Dec 6;324(4):791-805. PMID: 12460578

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