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©
2001 ChemGenes Corporation • 33 Industrial Way • Wilmington, MA 01887
Phone: 978-694-4503 • Fax: 978-694-4502 • Toll-Free: 800-762-9323 • E-Mail:
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DNA Helix Illustration by C. Slayden © 2001 American Association for the Advancement
of Science
Reprinted with permission from Science Magazine