...Aiko Nakagawa; Miho S. Kitazawa; Koichi Fujimoto ABSTRACT The bilateral symmetry of flowers is a striking morphological achievement during floral evolution, providing high adaptation potential for pollinators. The symmetry can appear when floral organ primordia developmentally initiate. Primordia...

... Cnidaria Bilateral symmetry Body axes Most animals belong to Bilateria (see Glossary, Box 1 ), a group encompassing organisms with three germ layers (ectoderm, endoderm and mesoderm) and two body axes, i.e. an anterior-posterior axis and a dorsal-ventral (D-V) axis. Body axes can be thought...

... a vertical midline that bisects the neuromast epithelium into perfect mirror-symmetric plane-polarized halves. Each half contains hair cells of identical planar orientation but opposite to that of the confronting half. The establishment of bilateral symmetry in this organ is poorly understood. Here, we show...

... that, in normal development, bilateral symmetry of the mouse blastocyst anticipates the polarity of the later conceptus. Moreover, our results show that transformation of the blastocyst axis of symmetry into the axes of the postimplantation conceptus involves asymmetric visceral endoderm cell movement. Therefore...

...Tobias Roeser; Stefan Stein; Michael Kessel ABSTRACT Studies in Xenopus laevis and zebrafish suggest a key role for β-catenin in the specification of the axis of bilateral symmetry. In these organisms, nuclear β-catenin demarcates the dorsalizing centers. We have asked whether β-catenin plays...

... for correspondence (e-mail: [email protected] ) 07 11 1996 © 1997 by Company of Biologists 1997 bilateral symmetry retina field prechordal mesoderm eye development Formation of bilaterally symmetric and asymmetric structures have been studied in vertebrates since the beginning...

... persistence of the intercellular bridge formed during its abstriction, and therefore provides an enduring marker of the animal pole of the zygote. Hence, according to the distribution of polar bodies, the axis of bilateral symmetry of the early blastocysts is normally aligned with the animalvegetal axis...

..., Oregon 97403, USA 10 09 1992 © 1992 by Company of Biologists 1992 bilateral symmetry Caenorhabditis elegans cell fate embryogenesis equivalence groups induction lateral signaling At the beginning of the 4-cell stage of embryogenesis in the nematode Caenorhabditis...

...-posterior axis bilateral symmetry Gastrulation transforms the organization of the cellularized amphibian egg (the late blastula) into the organization of the embryo, with a body axis characterized by an anterior-posterior succession of dorsal structures. This transformation entails widespread...