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BIOPHYSICS. For the article “CLOUDS, a protocol for deriving a molecular proton density via NMR,” by Alexander Grishaev and Miguel Llinás, which appeared in number 10, May 14, 2002, of Proc. Natl. Acad. Sci. USA (99, 6707–6712), Eq. 3 appeared incorrectly due to a printer's error. The correct equation appears below.
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