Correction

BIOCHEMISTRY. For the article “Protein folding and unfolding in microseconds to nanoseconds by experiment and simulation” by Ugo Mayor, Christopher M. Johnson, Valerie Daggett, and Alan R. Fersht, which appeared in number 25, December 5, 2000, of Proc. Natl. Acad. Sci. USA (97, 13518–13522), the authors note the following correction. In Results, in the last line of the last paragraph under the subheading “Kinetic Measurements,” β₈₄ should be β_T.