Chemical stability of PhaF.

<p>(<b>A</b>) Far-UV CD spectra of PhaF in the absence (solid line) and the presence (dashed line) of 4.1 M urea. (<b>B)</b>. CD-monitored urea titration of 3.8 µM PhaF (closed circles), 11.4 µM PhaF (open triangles) and C-PhaF (open circles). The solid lines represents the fitting to a two-state equilibrium denaturation transition (see text).