Errors for the yield data (Fig. 2b and Supplementary Figs. 2, 5) were estimated from TAR-tat binding data obtained in off-line ESI experiments under the same experimental conditions (data from ref. 6, also listed in the Source Data file) by calculation of the standard deviation of residuals from exponential fit functions as 3σ = 6%. Errors in yield ratio (Fig. 2c and Supplementary Figs. 2, 5b, 5d) were conservatively estimated by addition of the relative errors in yield.
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