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Perturbations of the χ2-rotamer distributions between the partially folded states and the highly disordered state in urea for ACBP (A) and ACTR (B). The population of the trans rotamer of the χ2-angle was estimated from the difference between δ(Cδ1) and δ(Cδ2) for leucine or from δ(Cδ) for isoleucine using the linear relationships reported previously.19,20
