Adelmann, H. B (1936). The problem of cyclopia. Pt. I. Quart. Rev. Biol 11, 161-182.
Adelmann, H. B (1936). The problem of cyclopia. Pt. II. Quart. Rev. Biol 11, 284-304.
Bachiller, D., Klingensmith, J., Kemp, C., Belo, J. A., Anderson, R. M., May, S. R., McMahon, J. A., McMahon, A. P., Harland, R. M., Rossant, J. and De Robertis, E. M (2000). The organizer factors Chordin and Noggin are required for mouse forebrain development. Nature 403, 658-661.[Medline]
Baker, J. C., Beddington, R. S. and Harland, R. M (1999). Wnt signaling in Xenopus embryos inhibits bmp4 expression and activates neural development. Genes Dev 13, 3149-3159.[Abstract/Free Full Text]
Barth, K. A., Kishimoto, Y., Rohr, K. B., Seydler, C., Schulte-Merker, S. and Wilson, S. W (1999). Bmp activity establishes a gradient of positional information throughout the entire neural plate. Development 126, 4977-4987.[Abstract]
Blitz, I. L. and Cho, K. W. Y (1995). Anterior neuroectoderm is progressively induced during gastrulation: the role of the Xenopus homeobox gene orthodenticle. Development 121, 993-1004.[Abstract]
Blumberg, B., Bolado, J. J., Moreno, T. A., Kintner, C., Evans, R. M. and Papalopulu, N (1997). An essential role for retinoid signaling in anteroposterior neural patterning. Development 124, 373-379.[Abstract]
Bourguignon, C., Li, J. and Papalopulu, N (1998). XBF-1, a winged helix transcription factor with dual activity, has a role in positioning neurogenesis in Xenopus competent ectoderm. Development 125, 4889-4900.[Abstract]
Bouwmeester, T., Kim, S.-H., Sasai, Y., Lu, B. and De Robertis, E. M (1996). Cerberus is a head-inducing secreted factor expressed in the anterior endoderm of Spemann's organizer. Nature 382, 595-601.[Medline]
Bradley, L., Wainstock, D. and Sive, H (1996). Positive and negative signals modulate formation of the Xenopus cement gland. Development 122, 2739-2750.[Abstract]
Bradley, L. C., Snape, A., Bhatt, S. and Wilkinson, D. G (1993). The structure and expression of the Xenopus Krox-20 gene: conserved and divergent patterns of expression in rhombomeres and neural crest. Mech. Dev 40, 73-84.[Medline]
Candia, A. F., Watabe, T., Hawley, H. B., Onichtchouk, D., Zhang, Y., Derynck, R., Niehrs, C. and Cho, K. W. Y (1997). Cellular interpretation of multiple TGF-beta signals: intracellular antagonism between activin/BVg1 and BMP-2/4 signaling mediated by Smads. Development 124, 4467-4480.[Abstract]
Chang, C. and Hemmati-Brivanlou, A (1998). Neural crest induction by Xwnt7B in Xenopus. Dev. Biol 194, 129-134.[Medline]
Chen, Y., Hollemann, T., Pieler, T. and Grunz, H (2000). Planar signalling is not sufficient to generate a specific anterior/posterior neural pattern in pseudoexogastrula explants from Xenopus and Triturus. Mech. Dev 90, 53-63.[Medline]
Chiang, C., Litingtung, Y., Lee, E., Young, K. E., Corden, J. L., Westphal, H. and Beachy, P. A (1996). Cyclopia and defective axial patterning in mice lacking Sonic hedgehog gene function. Nature 383, 407-413.[Medline]
Cho, K. W., Blumberg, B., Steinbeisser, H. and De Robertis, E. M (1991). Molecular nature of Spemann's organizer: the role of the Xenopus homeobox gene goosecoid. Cell 67, 1111-1120.[Medline]
Christian, J. L. and Moon, R. T (1993). Interactions between Xwnt-8 and Spemann organizer signaling pathways generate dorsoventral pattern in the embryonic mesoderm of Xenopus. Genes Dev 7, 13-28.[Abstract/Free Full Text]
Dale, L., Howes, G., Price, B. M. and Smith, J. C (1992). Bone morphogenetic protein 4: a ventralizing factor in early Xenopus development. Development 115, 573-585.[Abstract]
de Souza, F. S. J., Gawantka, V., Gomez, A. P., Delius, H., Ang, S.-L. and Niehrs, C (1999). The zinc finger gene Xblimp1 controls anterior endomesodermal cell fate in Spemann's organizer. EMBO J 18, 6062-6072.[Medline]
Dorsky, R. I., Moon, R. T. and Raible, D. W (1998). Control of neural crest cell fate by the Wnt signalling pathway. Nature 396, 370-373.[Medline]
Dupe, V., Ghyselinck, N. B., Wendling, O., Chambon, P. and Mark, M (1999). Key roles of retinoic acid receptors alpha and beta in the patterning of the caudal hindbrain, pharyngeal arches and otocyst in the mouse. Development 126, 5051-5059.[Abstract]
Durston, A. J., Timmermans, J. P., Hage, W. J., Hendriks, H. F., de Vries, N. J., Heideveld, M. and Nieuwkoop, P. D (1989). Retinoic acid causes an anteroposterior transformation in the developing central nervous system. Nature 340, 140-144.[Medline]
Ekker, S. C., McGrew, L. L., Lai, C. J., Lee, J. J., von, K. D., Moon, R. T. and Beachy, P. A (1995). Distinct expression and shared activities ofmembers of the hedgehog gene family of Xenopus laevis. Development 121, 2337-2347.[Abstract]
Ekker, S. C., Ungar, A. R., Greenstein, P., von, K. D., Porter, J. A., Moon, R. T. and Beachy, P. A (1995). Patterning activities of vertebrate hedgehog proteins in the developing eye and brain. Curr. Biol 5, 944-955.[Medline]
Fedi, P., Bafico, A., Nieto Soria, A., Burgess, W. H., Miki, T., Bottaro, D. P., Kraus, M. H. and Aaronson, S. A (1999). Isolation and biochemical characterization of the human Dkk-1 homologue, a novel inhibitor of mammalian Wnt signaling. J. Biol. Chem 274, 19465-19472.[Abstract/Free Full Text]
Foley, A. C., Storey, K. G. and Stern, C. D (1997). The prechordal region lacks neural inducing ability, but can confer anterior character to more posterior neuroepithelium. Development 124, 298329-96.
Franco, P. G., Paganelli, A. R., Lopez, S. L. and Carrasco, A. E (1999). Functional association of retinoic acid and hedgehog signaling in Xenopus primary neurogenesis. Development 126, 4257-4265.[Abstract]
Fredieu, J. R., Cui, Y., Maier, D., Danilchik, M. V. and Christian, J. L (1997). Xwnt-8 and lithium can act upon either dorsal mesodermal or neuroectodermal cells to cause a loss of forebrain in Xenopus embryos. Dev. Biol 186, 100-114.[Medline]
Gawantka, V., Delius, H., Hirschfeld, K., Blumenstock, C. and Niehrs, C (1995). Antagonizing the Spemann organizer: role of the homeobox gene Xvent-1. EMBO J 14, 6268-6279.[Medline]
Gawantka, V., Pollet, N., Delius, H., Pfister, R., Vingron, M., Nitsch, R., Blumenstock, C. and Niehrs, C (1998). Gene expression screening in Xenopus identifies molecular pathways, predicts gene function and provides a global view of embryonic patterning. Mech. Dev 77, 95-141.[Medline]
Gilbert, S. F. and Saxen, L (1993). Spemann's organizer: models and molecules. Mech. Dev 41, 73-89.[Medline]
Glinka, A., Delius, H., Blumenstock, C. and Niehrs, C (1996). Combinatorial signalling by Xwnt-11 and Xnr3 in the organizer epithelium. Mech. Dev 60, 221-231.[Medline]
Glinka, A., Wu, W., Delius, H., Monaghan, P. A., Blumenstock, C. and Niehrs, C (1998). Dickkopf-1 is a member of a new family of secreted proteins and functions in head induction. Nature 391, 357-362.[Medline]
Glinka, A., Wu, W., Onichtchouk, D., Blumenstock, C. and Niehrs, C (1997). Head induction by simultaneous repression of Bmp and wnt signalling in Xenopus. Nature 389, 517-519.[Medline]
Gont, L. K., Steinbeisser, H., Blumberg, B. and De Robertis, E. M (1993). Tail formation as a continuation of gastrulation: the multiple cell populations of the Xenopus tailbud derive from the late blastopore lip. Development 119, 991-1004.[Abstract]
Grinblat, Y., Gamse, J., Patel, M. and Sive, H (1998). Determination of the zebrafish forebrain: induction and patterning. Development 125, 4403-4416.[Abstract]
Harland, R. M (1991). In situ hybridization: an improved whole-mount method for Xenopus embryos. Methods Cell Biol 36, 685-695.[Medline]
Harland, R. M. and Gerhart, J (1997). Formation and function of Spemann's organizer. Annu. Rev. Dev. Biol 13, 611-667.[Medline]
Hashimoto, H., Itoh, M., Yamanaka, Y., Yamashita, S., Shimizu, T., Solnica-Krezel, L., Hibi, M. and Hirano, T (2000). Zebrafish Dkk1 Functions in Forebrain Specification and Axial Mesendoderm Formation. Dev. Biol 217, 138-152.[Medline]
Hata, A., Seoane, J., Lagna, G., Montalvo, E., Hemmati-Brivanlou, A. and Massague, J (2000). OAZ uses distinct DNA-and protein-binding zinc fingers in separate BMP-Smad and Olf signaling pathways. Cell 100, 229-240.[Medline]
Hemmati-Brivanlou, A., de, l. T. J., Holt, C. and Harland, R. M (1991). Cephalic expression and molecular characterization of Xenopus En-2. Development 111, 715-724.[Abstract]
Hemmati-Brivanlou, A., Kelly, O. G. and Melton, D. A (1994). Follistatin, an antagonist of activin, is expressed in the Spemann organizer and displays direct neuralizing activity. Cell 77, 283-295.[Medline]
Henningfeld, K. A., Rastegar, S., Adler, G. and Knochel, W (2000). Smad1 and Smad4 are Components of the BMP-4 Induced Transcription Complex of the Xvent-2B Promoter. J. Biol. Chem 275, 21827-21835.[Abstract/Free Full Text]
Hensey, C. and Gautier, J (1998). Programmed cell death during Xenopus development: a spatio-temporal analysis. Dev. Biol 203, 36-48.[Medline]
Hoppler, S., Brown, J. D. and Moon, R. T (1996). Expression of a dominant-negative wnt blocks induction of MyoD in Xenopus embryos. Genes Dev 10, 2805-2817.[Abstract/Free Full Text]
Hsieh, J. C., Kodjabachian, L., Rebbert, M. L., Rattner, A., Smallwood, P. M., Samos, C. H., Nusse, R., Dawid, I. B. and Nathans, J (1999). Anew secreted protein that binds to Wnt proteins and inhibits their activities. Nature 398, 431-436.[Medline]
Hsu, D. R., Economides, A. N., Wang, X., Eimon, P. M. and Harland, R. M (1998). The Xenopus dorsalizing factor gremlin identifies a novel family of secreted proteins that antagonize BMP activities. Mol. Cell 1, 673-683.
Iemura, S.-I., Yamamoto, T., Takagi, C., Uchiyama, H., Natsume, T., Shimasaki, S., Sugino, H. and Ueno, N (1998). Direct binding of follistatin to a complex of bone morphogenetic protein and its receptor inhibits ventral and epidermal cell fates in early Xenopus embryos. Proc. Natl. Acad. Sci. USA 95, 9337-9342.[Abstract/Free Full Text]
Itoh, K. and Sokol, S. Y (1999). Axis determination by inhibition of Wnt signaling in Xenopus. Genes Dev 13, 2328-2336.[Abstract/Free Full Text]
Jones, C. M., Lyons, K. M., Lapan, P. M., Wright, C. V. and Hogan, B. L (1992). DVR-4 (bone morphogenetic protein-4) as a posterior-ventralizing factor in Xenopus mesoderm induction. Development 115, 639-647.[Abstract]
Knecht, A. K., Good, P. J., Dawid, I. B. and Harland, R. M (1995). Dorsal-ventral patterning and differentiation of noggin-induced neural tissue in the absence of mesoderm. Development 121, 1927-1235.[Abstract]
Kroll, K. L. and Amaya, E (1996). Transgenic Xenopus embryos from sperm nuclear transplantations reveal FGF signaling requirements during gastrulation. Development 122, 3173-3183.[Abstract]
Krupnik, V. E., Sharp, J. D., Jiang, C., Robison, K., Chickering, T. W., Amaravadi, L., Brown, D. E., Guyot, D., Mays, G., Leiby, K., Chang, B., Duong, T., Goodearl, A. D., Gearing, D. P., Sokol, S. Y. and McCarthy, S. A (1999). Functional and structural diversity of the human Dickkopf gene family. Gene 238, 301-313.[Medline]
Kuhl, M., Sheldahl, L. C., Malbon, C. C. and Moon, R. T (2000). Ca2+/calmodulin-dependent protein kinase II is stimulated by Wnt and Frizzled homologs and promotes ventral cell fates in Xenopus. J. Biol. Chem 275, 12701-12711.[Abstract/Free Full Text]
LaBonne, C. and Bronner-Fraser, M (1998). Neural crest induction in Xenopus : evidence for a two-signal model. Development 125, 2403-2414.[Abstract]
Ladher, R., Mohun, T. J., Smith, J. C. and Snape, A. M (1996). Xom : a Xenopus homeobox gene that mediates the early effects of BMP-4. Development 122, 2385-2394.[Abstract]
Leyns, L., Bouwmeester, T., Kim, S.-H., Piccolo, S. and De Robertis, E. M (1997). Frzb-1 is a secreted antagonist of wnt-signals expressed in the Spemann organizer. Cell 88, 747-756.[Medline]
Li, H., Tierney, C., Wen, L., Wu, J. Y. and Rao, Y (1997). A single morphogenetic field gives rise to two retina primordia under the influence of the prechordal plate. Development 124, 603-615.[Abstract]
Macdonald, R., Barth, K. A., Xu, Q., Holder, N., Mikkola, I. and Wilson, S. W (1995). Midline signalling is required for Pax gene regulation and patterning of the eyes. Development 121, 3267-3278.[Abstract]
Mangold, O (1933). \206ber die Induktionsf\212higkeit der verschiedenen Bezirke der Neurula von Urodelen. Naturwissenschaften 21, 761-766.
Marom, K., Fainsod, A. and Steinbeisser, H (1999). Patterning of the mesoderm involves several threshold responses to BMP-4 and xwnt-8. Mech. Dev 87, 33-44.[Medline]
McGrew, L. L., Hoppler, S. and Moon, R. T (1997). Wnt and FGF pathways cooperatively pattern anteroposterior neural ectoderm in Xenopus. Mech. Dev 69, 105-114.[Medline]
Meersman, G., Verschueren, K., Nelles, L., Blumenstock, C., Kraft, H., Wuytens, G., Remacle, J., Kozak, C. A., Tylzanowsky, P., Niehrs, C. and Huylebroeck, D (1997). The C-terminal domain of Mad-like signal transducers is sufficient for biological activity in vivo and transcriptional activation. Mech. Dev 61, 127-140.[Medline]
Moon, R. T., Brown, J. D., Yang-Snyder, J. A. and Miller, J. R (1997). Structurally related receptors and antagonists compete for secreted wnt ligands. Cell 88, 725-728.[Medline]
Newman, C. S., Chia, F. and Krieg, P. A (1997). The XHex homeobox gene is expressed during development of the vascular endothelium: overexpression leads to an increase in vascular endothelial cell number. Mech. Dev 66, 83-93.[Medline]
Niederreither, K., Subbarayan, V., Dolle, P. and Chambon, P (1999). Embryonic retinoic acid synthesis is essential for early mouse post-implantation development. Nat. Genet 21, 444-448.[Medline]
Niehrs, C (1999). Head in the Wnt- the molecular nature of Spemann's head organizer. Trends Genet 15, 314-319.[Medline]
Nieuwkoop, P. D (1997). Short historical survey of pattern formation in the endo-mesoderm and the neural anlage in the vertebrates: the role of vertical and planar inductive actions. Cell. Mol. Life Sci 53, 305-318.[Medline]
Nishita, M., Hashimoto, M. K., Ogata, S., Laurent, M. N., Ueno, N., Shibuya, H. and Cho, K. W (2000). Interaction between Wnt and TGF-beta signalling pathways during formation of Spemann's organizer. Nature 403, 781-785.[Medline]
Onichtchouk, D., Gawantka, V., Dosch, R., Delius, H., Hirschfeld, K., Blumenstock, C. and Niehrs, C (1996). The Xvent-2 homeobox gene is part of the BMP-4 signaling pathway controling dorsoventral patterning of Xenopus mesoderm. Development 122, 3045-3053.[Abstract]
Pannese, M., Polo, C., Andreazzoli, M., Vignali, R., Kablar, B., Barsacchi, G. and Boncinelli, E (1995). The Xenopus homologue of Otx2 is a maternal homeobox gene that demarcates and specifies anterior body regions. Development 121, 707-720.[Abstract]
Pearce, J. J. H., Penny, G. and Rossant, J (1999). A mouse cerberus/dan-related gene family. Dev. Biol 209, 98-100.[Medline]
Pera, E. M. and Kessel, M (1997). Patterning of the chick forebrain anlage by the prechordal plate. Development 124, 41534162-.
Peng, H. B (1991). Xenopus laevis : Practical uses in cell and molecular biology. Solutions and protocols. Methods Cell. Biol 36, 659-.
Piccolo, S., Agius, E., Leyns, L., Bhattacharyya, S., Grunz, H., Bouwmeester, T. and De Robertis, E. M (1999). The head inducer Cerberus is a multifunctional antagonist of Nodal, BMP and Wnt signals. Nature 397, 707-710.[Medline]
Piccolo, S., Sasai, Y., Lu, B. and De Robertis, E. M (1996). Dorsoventral patterning in Xenopus: inhibition of ventral signals by direct binding of chordin to BMP-4. Cell 86, 589-598.[Medline]
Poznanski, A. and Keller, R (1997). The role of planar and early vertical signaling in patterning the expression of Hoxb-1 in Xenopus. Dev. Biol 184, 351-366.[Medline]
Rastegar, S., Friedle, H., Frommer, G. and Kn\232chel, W (1999). Transcriptional regulation of Xvent homeobox genes. Mech. Dev 81, 139-149.[Medline]
Roelink, H. and Nusse, R (1991). Expression of two members of the Wnt family during mouse development \320 restricted temporal and spatial patterns in the developing neural tube. Genes Dev 5, 381-388.[Abstract/Free Full Text]
Roelink, H., Augsburger, A., Heemskerk, J., Korzh, V., Norlin, S., RuiziAltaba, A., Tanabe, Y., Placzek, M., Edlund, T., Jessell, T. M. et al. ( (1994). Floor plate and motor neuron induction by vhh-1, a vertebrate homolog of hedgehog expressed by the notochord. Cell 76, 761-775.[Medline]
Ruiz i Altaba, A. and Jessell, T. M (1991). Retinoic acid modifies mesodermal patterning in early Xenopus embryos. Genes Dev 5, 175-187.[Abstract/Free Full Text]
Ruiz i Altaba, A. and Jessell, T. M (1991). Retinoic acid modifies the pattern of cell differentiation in the central nervous system of neurula stage Xenopus embryos. Development 112, 945-958.[Abstract]
Ruiz i Altaba, A (1993). Induction and axial patterning of the neural plate: planar and vertical signals. J. Neurobiol 24, 1276-1304.[Medline]
Ruiz i Altaba, A (1998). Neural patterning. Deconstructing the organizer. Nature 391, 748-749.[Medline]
Saint-Jeannet, J.-P., He, X., Varmus, H. and Dawid, I. B (1997). Regulation of dorsal fate in the neuraxis by Wnt-1 and Wnt-3a. Proc. Natl. Acad. Sci. USA 94, 13713-13718.[Abstract/Free Full Text]
Salic, A. N., Kroll, K. L., Evans, L. M. and Kirschner, M. W (1997). Sizzled: a secreted Xwnt8 antagonist expressed in the ventral marginal zone of Xenopus embryos. Development 124, 4739-4748.[Abstract]
Sampath, K., Rubinstein, A. L., Cheng, A. M., Liang, J. O., Fekany, K., Solnica, K. L., Korzh, V., Halpern, M. E. and Wright, C. V (1998). Induction of the zebrafish ventral brain and floorplate requires cyclops/nodal signalling. Nature 395, 185-189.[Medline]
Sasai, Y. and De Robertis, E. M (1997). Ectodermal patterning in vertebrate embryos. Dev. Biol 182, 5-20.[Medline]
Schier, A. F., Neuhauss, S. C., Harvey, M., Malicki, J., Solnica, K. L., Stainier, D. Y., Zwartkruis, F., Abdelilah, S., Stemple, D. L., Rangini,Z., Yang, H. and Driever, W (1996). Mutations affecting the development of the embryonic zebrafish brain. Development 123, 165-178.[Abstract]
Schier, A. F., Neuhauss, S. C., Helde, K. A., Talbot, W. S. and Driever, W (1997). The one-eyed pinhead gene functions in mesoderm and endoderm formation in zebrafish and interacts with no tail. Development 124, 327-342.[Abstract]
Schneider, V. A. and Mercola, M (1999). Spatially distinct head and heart inducers within the Xenopus organizer region. Curr. Biol 9, 800-809.[Medline]
Sharpe, C. and Goldstone, K (2000). The control of Xenopus embryonic primary neurogenesis is mediated by retinoid signalling in the neurectoderm. Mech. Dev 91, 69-80.[Medline]
Sharpe, C. R (1991). Retinoic acid can mimic endogenous signals involved in transformation of the Xenopus nervous system. Neuron 7, 239-247.[Medline]
Sive, H. L., Draper, B. W., Harland, R. M. and Weintraub, H (1990). Identification of a retinoic acid-sensitive period during primary axis formation in Xenopus laevis. Genes Dev 4, 932-942.[Abstract/Free Full Text]
Slack, J (1994). Role of fibroblast growth factors as inducing agents in early embryonic development. Mol. Reprod. Dev 39, 118-124.[Medline]
Smith, J. C., Price, B. M., Green, J. B., Weigel, D. and Herrmann, B. G (1991). Expression of a Xenopus homolog of Brachyury (T) is an immediate-early response to mesoderm induction. Cell 67, 79-87.[Medline]
Smith, W. C. and Harland, R. M (1991). Injected Xwnt-8 RNA acts early in Xenopus embryos to promote formation of a vegetal dorsalizing center. Cell 67, 753-765.[Medline]
Suzuki, A., Chang, C., Yingling, J. M., Wang, X. F. and Hemmati-Brivanlou, A (1997). Smad5 induces ventral fates in Xenopus embryo. Dev. Biol 184, 402-405.[Medline]
Suzuki, A., Thies, R. S., Yamaji, N., Song, J. J., Wozney, J. M., Murakami, K. and Ueno, N (1994). A truncated bone morphogenetic protein receptor affects dorsal-ventral patterning in the early Xenopus embryo. Proc. Natl. Acad. Sci. USA 91, 10255-10259.[Abstract/Free Full Text]
Takada, S., Stark, K. L., M.J., S., Vassileva, G. and McMahon, J. A (1994). Wnt-3a regulates somite and tailbud formation in the mouse embryo. Genes Dev 8, 174-189.[Abstract/Free Full Text]
Thisse, B., Wright, C. V. and Thisse, C (2000). Activin-and Nodal-related factors control antero-posterior patterning of the zebrafish embryo. Nature 403, 425-428.[Medline]
Wang, S., Krinks, M., Lin, K., Luyten, F. P. and Moos, M (1997). Frzb, a secreted protein expressed in the Spemann organizer, binds and inhibits Wnt-8. Cell 88, 757-766.[Medline]
Wang, S., Krinks, M. and Moos, M. J (1997). Frzb-1, an antagonist of Wnt-1 and Wnt-8, does not block signaling by Wnts3A, 5A, or11. Biochem. Biophys. Res. Commun 236, 502-504.[Medline]
Wilson, P. A., Lagna, G., Suzuki, A. and Hemmati-Brivanlou, A (1997). Concentration-dependent patterning of the Xenopus ectoderm by BMP4 and its signal transducer Smad1. Development 124, 3177-3184.[Abstract]
Wolda, S. L., Moody, C. J. and Moon, R. T (1993). Overlapping expression of Xwnt-3A and Xwnt-1 in neural tissue of Xenopus laevis embryos. Dev. Biol 155, 46-57.[Medline]
Zaraisky, A. G., Lukyanov, S. A., Vasiliev, O. L., Smirnov, Y. V., Belyavsky, A. V. and Kazanskaya, O. V (1992). A novel homeobox gene expressed in the anterior neural plate of the Xenopus embryo. Dev. Biol 152, 373-382.[Medline]
Zimmerman, L. B., De Jes\234s-Escobar, J.-E. and Harland, R. M (1996). The Spemann organizer signal noggin binds and inactivates bone morphogenetic protein-4. Cell 86, 599-606.[Medline]
Zoltewicz, J. S. and Gerhart, J. C (1997). The Spemann organizer of Xenopus is patterned along its anteroposterior axis at the earliest gastrula stage. Dev. Biol 192, 482-491.[Medline]
