B Number is the board number

Patterning
B1 Indian hedgehog is required for normal differentiation of ES cell embryoid bodies.
P. Maye, S. Becker, L. Kasameyer, N. Byrd and L. Grabel. Wesleyan Univ., CT.

B2 The cdx-4 homeobox gene plays a role in anterior-posterior patterning in the mouse embryo
D.M. Boucher, M.L. Flannery, J.J. Meneses, R.A. Pedersen. UC San Francisco, CA.

B3 Hoxc13 and Naked mice
A.R. Godwin and M.R. Capecchi. Univ. of Kansas Med. Ctr., KS; HHMI,/Univ. of Utah, UT.

B4 Fgf8 can activate Gbx2 and transform regions of the rostral mouse brain into a hindbrain fate
A. Liu, K. Losos, A. Joyner. HHMI and Skirball Inst., NYU Sch. of Med., NY.

B5 Molecular genetics of murine mid-hindbrain patterning
H.X. Chen, Y. Lun, L. Gan, J.A. Golden and R.L. Johnson. UT MD Anderson Cancer Ctr.; Univ. of Penn. Sch. of Medicine.

B6 The mouse mesoderm development (mesd) mutation uncouples head and trunk organizer function.
K. Brown, M.E. Wines, S. Wefer, C. DeRossi and B.C. Holdener. SUNY at Stony Brook, NY.

B7 The role of Tbx6 in mouse paraxial mesoderm formation.
D.L. Chapman and V.E. Papaioannou. Univ. of Pittsburgh, PA and Columbia Univ. Coll. of Physicians and Surgeons, NY.

B8 Shh is essential for the determination of the epaxial muscle lineage.
A.G. Borychki, B. Brunk, S. Tajbakshk2 M. Buckingham, C. Chiang and C.P. Emerson. U Penn. Sch. of Med., PA, Pasteur Inst., France and Vanderbilt Univ., TN.

B9 Induction of hematopoietic and vascular mesoderm by souble endodermal signals in the gastrulating mouse embryo.
M.H. Baron, D. Ramirez and J. Zavadil. Mount Sinal Sch. of Med., NY.

B10 Physical forces may shift HOX clusters in an environment allowing expression
S.Papageorgiou. N.R.C. Demokritos, Greece.

B11 Testing Hox genes by surgical manipulation.
J.L. Nowicki and A.C. Burke. Univ. of North Carolina at Chapel Hill, NC.

B12 Hox gene expression and regulation in the presumptive wing region of the chick lateral plate mesoderm
K.C. Oberg and G. Eichele. Baylor Coll. of Med., TX.

B13 En1 plays multiple roles in vertebrate limb development
R. Kimmel, C. Loomis, K. Losos, D. Turnbull, A. Joyner. HHMI and Skirball Inst., NYUMC, NY.

B14 Analysis of LHX2b's dorsalizing effect in the chick hindlimb
L.L. Wong, R.D. Riddle. Univ. of Pennsylvania, PA.

B15 Expression of the Spemann organizer genes, cerberus, frzb and Xlim-1 are dependent on siamois and TGF signaling
M.J. Engleka and D.S. Kessler. Univ. of Pennsylvania, PA

B16 Xenopus antivin, a novel antagonistic factor involved in left-right morphological determination.
A.M.S. Cheng, C. Thisse, B. Thisse and C.V.E. Wright. Vanderbilt Univ. Med. Ctr., TN and Univ. of Louis Pasteur, France.

B17 Direct repression of Xwnt8 by goosecoid regulates Xenopus anterior development
J. Yao and D.S. Kessler. Univ. of Pennsylvania, PA.

B18 Xrx1 in Xenopus eye and anterior brain development
M. Andreazzoli, G. Gestri1, D. Angeloni, E. Menna1 and G. Barsacchi. Univ. of Pisa, Italy; NICHD/NIH, MD, NCI/FCRF, MD.

B19 Pituitary adenylate cyclase activating peptide (PACAP) and receptor expression in the Xenopus neural tube: potential role in patterning and neurogenesis.
J.A. Waschek, Z. Hu, A. Chao, V. Lelievre, X. Zhou and W.I. Rodriguez. UC Los Angeles, CA.

B20 Fate mapping the Xenopus endoderm
D.R. Knutson, N.M. Nascone. Eckerd Coll., FL.

B21 Spatially distinct head and heart inducers in the Xenopus organizer
V.A. Schneider and M. Mercola. Harvard Med. Sch., MA.

B22 Vaccinia as a tool for functional analysis of limb regeneration.
S. Roy, D.M. Gardiner and S.V. Bryant. UC Irvine, CA.

B23 Reassessment of inducing factors in primitive blood development of Xenopus embryos
G. Kumano and W.C. Smith. UC Santa Barbara, CA.

B24 A panel of transgenic reporter lines in Xenopus tropicalis
L.B. Zimmerman, J. Gray and R.M. Grainger. Univ. of Virginia, VA.

B25 Delta-mediated lateral inhibition regulates specification of trunk but not cranial neural crest in zebrafish
R.A. Cornell and J.S. Eisen. Univ. of Oregon, OR.

B26 Zebrafish nodal-related 2/Squint encodes an early acting mesendodermal inducer acting from the extraembryonic YSL.
C.E. Erter, L. Solnica-Krezel and C.V. Wright. Vanderbilt Univ., TN.

B27 FGF signaling and mesodermal patterning in the zebrafish embryo
B.W. Draper, J.B. Phillips, D. Stock and C.B. Kimmel. Univ. of Oregon, OR; Penn. State Univ., PA.

B28 Regulation of axis development by antagonism of lefty and nodal signaling.
B.W. Bisgrove, J.J. Essner and H.J. Yost. Univ. of Utah.

B29 Evidence that signals from the somites play a role in the proper anteroposterior patterning of the notochord.
L.A. Rohde and R.K. Ho. Princeton Univ., NJ.

B30 A role for zebrafish meis and hoxa1 as integration points for dorsoventral and anteroposterior axial signals
C. Sagerstrom, N. Vlachakis, D. Ellstrom. Univ. of Massachusetts Med. Sch., MA.

B31 A hierarchy of dorsalized and ventralized mutants in the zebrafish
D.S. Wagner and M.C. Mullins. U. of Pennsylvania, PA.

B32 Antagonism of BMP activity during zebrafish gastrulation
V. Miller-Bertoglio, M. Furthauer, A. Carmany-Rampey, B. Thisse, C. Thisse, L. Solnica-Krezel and M.E. Halpern. Carnegie Inst. of Washington, MD; Institut de Genetique et de Biologie Molec. et Cell., France; Vanderbilt Univ., TN.

B33 The function of SOG in specifying positional information in the dorsal ectoderm of the Drosophila embryo
E. Decotto, J. Neul and C. Ferguson. Univ. of Chicago, IL.

B34 Maternal sog and dpp pattern the embryonic dorso-ventral axis by modifying the Dorsal nuclear gradient
H. Araujo and E. Bier. UC San Diego, CA.

B35 Regulation of Ci levels in the imaginal discs of Drosophila by comb gap
G. Campbell and A. Tomlinson. Univ. of Pittsburgh, PA and Columbia Univ., NY.

B36 Expression of some wing morphogenetic genes in Lyra imaginal discs
L.A. Abbott and C. Zidar. Univ. of Colorado-Boulder, CO.

B37 The role of the micromeres in notch activation and mesoderm induction in the sea urchin embryo.
H.C. Sweet and C.A. Ettensohn. Carnegie Mellon Univ., PA.

B38 Supernumerary eyes result from heavy water treatment in 4-cell embryos of the snail Ilyanassa obsoleta
M.B.Goulding. Univ. of Texas at Austin, TX

Cell Biology of Development
B77 Nodal and activin in placental development
G.T. Ma, K.C. Pfendler, P.M. Iannaccone, M.R. Kuehn and D.I.H. Linzer. Northwestern Univ.,
IL; Children's Mem. Inst. for Educ. and Res., IL; NCI/NIH, MD.

B78 Regulation of mesodermal competence in Xenopus laevis is not cell autonomous
K.L. Curran and R.M. Grainger. Univ. of Virginia, VA.

B79 A search for dominant genetic modifiers of the Drosophila fish-hook gene
M. Mutsuddi, A. Mukherjee and J.R. Nambu. U Massachusetts-Amherst, MA.

B80 Skeletal muscle fiber type diversity in vitro is regulated by protein kinase C activity.
J.X. Dimario and P.E. Funk. FUHS/Chicago Med. Sch., IL

B81 The zebrafish curly tail monster gene product is required for hedgehog signal transduction and for the development of slow muscle identity
M.J. Barresi, H.L. Stickney, S.H. Devoto. Wesleyan Univ., CT.

B82 Localization of the polarity proteins, aPKC and ASIP/PAR-3, in Xenopus laevis
M. Nakaya, A. Fukui, Y. Izumi, M. Asashima, S. Ohno. Yokohama City Univ. Sch. of Med., Univ. of Tokyo, Japan.

B83 Expression of ADAMs in the developing rat heart
W.E. Carver, D.Oxner, T. Burnside, L. Terracio and T.K. Borg. U South Carolina Sch. of Med., SC.

B84 Wheat germ agglutinin labeling of structures in the blastocoel of living sea urchin embryos
N.M. Mozingo. Miami Univ., OH and Arizona State Univ., AZ.

B85 Mechanisms of regulation of trunk neural crest in zebrafish embryos
J.L. Vaglia and B.K. Hall. Dalhousie Univ., Canada.

B86 Investigating the roles of PAX6 in cortical development
H. Pearson, P. Rashbass, N. Warren, D. Price and V. van Heyningen. MRC Human Genet. Unit, Western Gen. Hosp. UK; Univ. Med. Sch., UK,

B87 Expression of a novel cytoskeletal protein in the developing mouse embryo
M. Parast, A. Sutherland and C. Otey. Univ. of Virginia, VA; U North Carolina-Chapel Hill, NC.

B88 Shroom is a PDZ domain-containing cytoskeletal protein required for neural tube morphogenesis in mice.
J.D. Hildebrand and P. Soriano. Fred Hutchinson Cancer Res. Ctr., WA.

B89 Altering intracellular ph distrupts cytoplasmic organization in early hamster embryos
J.M. Squirrell and B.D. Bavister. Univ. of Wisconsin-Madison, WI.

B90 Membrane dynamics during cytokinesis in Xenopus
M.V. Danilchik, E.E. Brown, K. Larkin, K.Ray. Oregon Hlth. Sci. Univ., OR.

B91 Fibronectin matrix is required for radial intercalation and epiboly during Xenopus gastrulation
M. Marsden, D.W. DeSimone. Univ. of Virginia, VA.

B92 Function(s) of SPARC in Xenopus laevis somite development and contraction.
M. Huynh and M. Ringuette. Univ. of Toronto, Canada.

B93 Overexpression of the Xenopus tight junction protein Claudin affects cell adhesion and results in defects in left-right asymmetry
B.J. Brizuela, E.M. De Robertis. UC Los Angeles, CA.

B94 The expression and function of alpha 7 integrin in mouse embryo trophoblast differentiation.
E.J. Klaffky, R.G. Williams, B.L. Ziober, R.H. Kramer and A.E. Sutherland. Univ. of Virginia, VA, and UC San Francisco, CA.

B95 A functional role for specific isoforms of the integrin in the early development of acetylcholine receptor clusters.
D.J. Burkin, M. Gu, G.Q. Wallace and S.J. Kaufman. Univ. of Illinois-Urbana, IL.

B96 Regulation of trophoblast cell protrusive activity and adhesion.
P.M. Martin, S.E. Aeder and A.E. Sutherland. Univ. of Virginia, VA.

B97 The role of chondroitin sulfate in early avian development
D.R. Canning, A. Abubaker and T. Amin. Murray State Univ., KY.

B98 A protein containing disintegrin and ornatin like domains modulates cell adhesion in Dictyostelium
T. Varney, E. Casademunt, C. Petty, B. Kondo, J. Dolman and D.D. Blumberg. Univ. MD- Baltimore County, MD.

B99 Insertional mutagenesis through gene trap approaches in Xenopus embryos
O. Bronchain and E. Amaya. Univ. of Cambridge, U.K.

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