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Circular dichroism spectra showing structural transitions in rP172 when titrated with SDS at pH 3.5 (left panel) and pH 8.0 (right panel) below (a and c) and above (b and d) the critical micelle concentrations of SDS. SDS, at a concentration of 500 M and at pH3.5, stabilizes the alpha helical structure in rP172 likely through charge-charge interaction (a).
