Affiliation: | From the ‡Biomedical Sciences Department, LIU Post, Brookville, New York 11548.;the §Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, and ;the ¶Laboratory of Gene Regulation and Development, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892 |