Figure 6.

Repeated unfolding-refolding of T4 lysozyme molecules in a polymer. The curves were obtained by stretching and relaxing the same polymer multiple times. (A) The unfolding traces of the unfolding-refolding cycles. The blue dots mark the positions where unfolding occurs. Three complete unfolding and refolding cycles are shown in B. The numbers on the right indicate the order of the curves in the sequence displayed in A. The force curves in these plots are shifted vertically for clarity, so they do not share a common zero force level.