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Comparison of positions of BRCT1 between LigIV/XRCC4 and Lif1p/Lig4p. Structures of LigIV/XRCC4 (violet/silver) and Lifp1/Lig4p (green/gold) were superimposed based on XIR and LIR. The figure is a view of the C- to N-terminal direction of the coiled-coils of XRCC4 and Lif1p. The N-terminals and helices of BRCT1 of LigIV and Li4p are labeled with violet and green, respectively.
