Fig. S5.

¹⁵N R_ex of Myb32 in the presence of KIX and MLL28 measured by the R₂ relaxation dispersion experiments with 500-MHz (Left) and 800-MHz (Right) spectrometers. ¹⁵N-Myb32:KIX:MLL28 concentration ratios are shown in each panel. R_ex was estimated from the difference in $R_2^{\text{eff}}$ at the lowest and highest 1/τ_cp values.