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About the Cover
The image of a single crystal of the amino acid DL-leucine reveals the individual methyl groups at the end of each amino acid molecule as white spots. It was taken with an atomic force microscope. See page 209. [Photograph by Scot Gould, Department of Physics, University of California, Santa Barbara, CA 93106] |
Science. ISSN 0036-8075 (print), 1095-9203 (online)