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Electrophoretic mobilities of Int and Int+Gp44 bound to reconstructed att sites. The binding of the Int dimer shifts the mobilities of the DNA fragments. Gp44 binding further retards Int complexes on attP, attL, and attR but increases the electrophoretic mobility on attB complexes, even though the mass is increased by 17 kDa. The differences in migrations are believed to reflect the architectures of the different complexes, specifically the trajectories of the CC motifs.
