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Two possible models for Xenopus gastrulation movement. The Regression Model (upper panel): the presumptive head region is specified first at the onset of gastrulation and then axial mesoderm is formed toward posterior. The Progression Model (lower panel): the chordamesoderm is progressively formed toward anterior and the head rudiment is specified at mid to late gastrulation stage. For details, see the article by Koide et al. in this issue.
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Review
Induction and Patterning of the Cardiac Conduction System
by David J. Pennisi, Stacey Rentschler, Robert G. Gourdie, Glenn I. Fishman and Takashi Mikawa
Original
Articles
When does the anterior endomesoderm meet the anterior-most neuroectoderm during Xenopus gastrulation?
by Tetsuya Koide, Kazuhiko Umesono and Chikara Hashimoto
Type I cadherins are required for differentiation and coordinated rotation in Xenopus laevis somitogenesis
by Emiliana Giacomello, Jerome Vallin, Olivier Morali, Ivan S. Coulter, Habib Boulekbache, Jean P. Thiery and Florence Broders
Establishment of the organizing activity of the lower endodermal half of the dorsal marginal zone is a primary and necessary event for dorsal axis formation in Cynops pyrrhogaster
by Koji Sakaguchi, Teruo Kaneda, Miwako Matsumoto, Hiroshi Imoh and Akio S. Suzuki
Physiological and induced apoptosis in sea urchin larvae undergoing metamorphosis
by Maria C. Roccheri, Cinzia Tipa, Rosa Bonaventura and Valeria Matranga
Roles of insulin-like growth factors and their binding proteins in the differentiation of mouse tongue myoblasts
by Akira Yamane, Toki Urushiyama and Thomas G.H. Diekwisch
Targeted disruption of fibroblast growth factor receptor-1 blocks maturation of visceral endoderm and cavitation in mouse embryoid bodies
by Milan Esner, Jiri Pachernik, Ales Hampl and Petr Dvorak
Short Communication
Expression of aVb3 integrin in the chick embryo aortic endothelium
by Catherine Corbel
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