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Copyright Illustration of a man by Leonardo da Vinci

Copyright © 2000 by BSCS and Videodiscovery, Inc. All rights reserved. You have the permission of BSCS and Videodiscovery, Inc. to reproduce items in this module for your classroom use. The copyright on this module, however, does not cover reproduction of these items for any other use. For permissions and other rights under this copyright, please contact BSCS, 5415 Mark Dabling Blvd., Colorado Springs, CO 80918-3842, www.bscs.org, info@bscs.org, (719) 531-5550.

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This material is based on work supported by the National Institutes of Health under Contract No: 263-98-C-0056. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the funding agency.