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Tat-SF1 prefers SF3b1 ULM5 by isothermal titration calorimetry analysis of binding. A, apparent equilibrium affinities (KA) of the indicated SF3b1 ULMs binding Tat-SF1 (residues 1–360). SF3b1ULM, SF3b1 residues 190–344. Unpaired, two tailed t-tests with Welch's correction: **, p < 0.005; ****, p < 0.0001. B–G, representative isotherms of the titrations.
