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Science  17 Mar 2000:
Vol. 287, Issue 5460, pp. 1883
DOI: 10.1126/science.287.5460.1883d

Every week, the editors of Science select one of the journal's Perspectives for special online treatment. The result: Enhanced Perspectives—thought-provoking overviews of cutting-edge research, bulging with hyperlinks to related Web resources. For an archive of past Enhanced Perspectives sorted by subject, and a pointer to this week's edition on catalytic chemistry, follow the link at

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