...Ezzat El-Sherif; Michalis Averof; Susan J. Brown In Drosophila , all segments form in the blastoderm where morphogen gradients spanning the entire anterior-posterior axis of the embryo provide positional information. However, in the beetle Tribolium castaneum and most other arthropods, a number...

... of the syncytial blastoderm of Drosophila the plasma membrane begins to fold in and forms the furrow canals in a regular hexagonal pattern. Every furrow canal leads the invagination of membrane between adjacent nuclei. Concomitantly with furrow canal formation, actin filaments are assembled at the furrow canal...

... and are maintained by a midline barrier. As such, the left and right sides of an embryo can be viewed as distinct and autonomous fields. Here we describe a series of experiments that indicate that the initiation of these programs requires communication between the two sides of the blastoderm. When deprived of either...

..., we have developed an improved model system for analyzing neural induction and patterning using transverse blastoderm isolates obtained from gastrulating chick embryos. We use this model to establish the timing of neural specification and the spatial distribution of perinodal cells having organizer...

... ABSTRACT Epiboly, the enveloping of the yolk cell by the blastoderm, is the first zebrafish morphogenetic movement. We isolated four mutations that affect epiboly: half baked, avalanche, lawine and weg . Homozygous mutant embryos arrest the vegetal progress of the deep cells of the blastoderm; only...

... activin blastoderm axial structure The mechanisms involved in the generation of axial structures in the chick are well documented. Between stage X and stage XIII (Eyal-Giladi and Kochav, 1976) the one-layer-thick chick blastoderm, containing the peripheral area opaca (AO), the marginal zone (MZ...

...M. Watanabe; M. Kinutani; M. Naito; O. Ochi; Y. Takashima ABSTRACT Blastodermal chimeras were constructed by transferring quail cells to chick blastoderm. Contribution of donor cells to host were histologically analyzed utilizing an in situ cell marker. Of the embryos produced by Injection of stage...

... mutation blastoderm Many decades of observation have produced detailed descriptions of the morphological changes in mitosis. More recently, the analysis of the cell cycle has been extended to a molecular and biochemical level (Pickett-Heaps et al . 1982 ; McIntosh, 1984 ; Murray, 1989). One...

... of embryos from an inbred line of Dwarf White Leghorns (that have white feathers due to the dominant allele at the I locus). Of 53 Dwarf White Leghorn embryos that were injected with Barred Plymouth Rock blastodermal cells, 6 (11.3 %) were phenotypically chimeric with respect to feather colour and one...

... transcription in a different manner than a single gap gene. 17 08 1989 © 1989 by Company of Biologists 1989 gap genes pair-rule genes blastoderm Drosophila embryogenesis Analyses of terminal phenotypes and of segmentation gene expression patterns in various mutant embryos has...

...Malka Ginsburg; Hefzibah Eyal-Giladi ABSTRACT The migration of the PGCs from a stage XIII epiblast into the germinal crescent of a stage 10 chick blastoderm was experimentally investigated. Considerable numbers of PGCs start to come down from the epiblastic layer at stage XII–XIII and continue...

... layers of the membrane indicates that each layer has a distinctive polypeptide composition, the outer layer containing in particular lysozyme and avidin. The evidence obtained in this study indicates that the lectin is not involved in adhesion of the blastoderm to the vitelline membrane; neither...