Figure 1.
(A) Comparison of crosspeak intensities (in units of RMS of noise) in the nonexchanged sample (gray), the sample exchanged in the dark for 24 h (blue), and the sample exchanged under illumination for 90 min (red). (B) Same as in A, but with the illuminated sample exchanged for an additional 180 min (red). The secondary structure of ASR derived from x-ray and SSNMR data (11) is shown on top.