Complex sentence: In a two-state system, folding and unfolding rates dominate the observed relaxation rates below and above the denaturation midpoint (Cm), respectively, thus giving rise to the terminology of folding and unfolding arms for the limbs of the chevron.
Split into simpler sentences: In a two-state system, folding and unfolding rates dominate the observed relaxation rates below and above the denaturation midpoint (Cm). This gives rise to the terminology of folding and unfolding arms for the limbs of the chevron.