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Volume 180, no. 5, p. 1134, Acknowledgments: The first paragraph should read as shown below.
This work was supported by grant DE-FG02-95ER20198 to J.G.F. from the Department of Energy-Basic Energy Sciences, by National Institutes of Health Individual National Research Service Award 5F32GM16107 to K.S.-W., and by NSF grant DBI-9602232 to R.D.M.
