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BIOPHYSICS. For the article “Fluorescence polarization of green fluorescence protein,” by Shinya Inoué, Osamu Shimomura, Makoto Goda, Mykhailo Shribak, and P. T. Tran, which appeared in number 7, April 2, 2002, of Proc. Natl. Acad. Sci. USA (99, 4272–4277), the last closing parenthesis on Eqs. 3 and 4 should appear at the end of the equations. The correct equations appear below.
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