... a specific function, the elements of organizers in other species are dispersed in time and space. This observation urges us to reconsider the universality and meaning of the organizer concept. Axial organization Spemann Body plan Neural induction Organizer Vertebrate embryo Wellcome Trust...

... of the basic body plan for animals within a phylum. Morphological observations have suggested hourglass-like divergence in various vertebrate and invertebrate groups, and recent molecular data support this model. However, further investigation is required to determine whether the phylotypic period represents...

... use, distribution and reproduction in any medium provided that the original work is properly attributed. Cell asymmetries Body plan Oogenesis Intracellular transport Cytoskeleton Microtubules Motor proteins The transport of cargos by motors contributes to cytoplasmic...

...Eric Röttinger; Christopher J. Lowe Hemichordates are a deuterostome phylum, the sister group to echinoderms, and closely related to chordates. They have thus been used to gain insights into the origins of deuterostome and chordate body plans. Developmental studies of this group have a long...

...Cynthia L. Hughes; Thomas C. Kaufman The diversity of the arthropod body plan has long been a fascinating subject of study. A flurry of recent research has analyzed Hox gene expression in various arthropod groups, with hopes of gaining insight into the mechanisms that underlie their evolution...

...-mail: [email protected]) 11 7 2001 © 2001. 2001 Mouse embryo Polarity Blastocyst Axis Embryonic Abembryonic Body plan A growing body of evidence indicates that although the early mouse embryo has remarkable flexibility in responding to developmental perturbations, its...