geons of Columbia University. She earned her Ph.D. in genetics from the University of Cambridge, England. Her research interests include implantation, embryonic cell lineages and the genetics of early embryonic development, using mutations and transgenic technology.

GARY SCHOENWOLF, University of Utah, Salt Lake City, UT. Dr. Schoenwolf is professor of neurobiology and anatomy, and member of the Huntsman Cancer Institute at the University of Utah School of Medicine. He earned his M.S. and Ph.D. in zoology from the University of Illinois, Champaign-Urbana. His research interests include gastrulation, neurulation, and neuraxial patterning.

FRANK WELSCH, Chemical Industry Institute of Toxicology (CIIT), Research Triangle Park, NC. Dr. Welsch is senior scientist and head of the Teratology Laboratory at CIIT. He earned his qualification as a veterinarian and doctor medicinae veterinariae degree from the Veterinary School of Freie Universität, Berlin, Germany. His research interests include development of new testing methods to predict developmental toxicity hazards.

WILLIAM B. WOOD, University of Colorado, Boulder, CO. Dr. Wood is a professor in the Department of Molecular, Cellular and Developmental Biology at the University of Colorado, Boulder, and a member of the Cancer Institute, University of Colorado Health Sciences Center, Denver. He earned his Ph.D. in biochemistry from Stanford University. He studies the developmental genetics and molecular biology of embryonic pattern formation and sex determination in the nematode Caenorhabditis elegans. Dr. Wood is a fellow of the American Academy of Arts and Sciences and a member of the National Academy of Sciences.

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