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The K10 female sterility locus involved in establishment of the embryonic dorsoventral axis maps genetically to the 2E2-2F1 interval of the Drosophila X chromosome. We microdissected the 2E2-2F3 region from salivary gland chromosomes and used clones obtained from the microdissected fragments to establish a chromosomal walk covering more than 200 kb. To(More)
We examined the role of Notch signaling on the generation of neurons and glia from neural stem cells by using neurospheres that are clonally derived from neural stem cells. Neurospheres prepared from Dll1(lacZ/lacZ) mutant embryos segregate more neurons at the expense of both oligodendrocytes and astrocytes. This mutant phenotype could be rescued when(More)
EGF-responsive C17 murine-derived neural stem cells (neurospheres) were grafted into the dentate gyrus of adult male rats after dentate granule cells lesions produced by colchicine injections. Behavioural performance was evaluated over two post-grafting periods, using tests sensitive to hippocampal dysfunctions. The first period began 1 month after grafting(More)
The four alfalfa mosaic virus RNAs (respectively 24 S, 20 S, 17 S and 12 S) have been used separately as messengers in two in vitro protein synthesizing systems: wheat germ and rabbit reticulocyte lysate. In both systems a polypeptide corresponding to the translation of the entire length of the RNA can be found for RNAs 24 S, 20 S and 12 S, but not for 17 S(More)
Several lines of evidence suggest that the origin of pattern formation of Drosophila embryos must be traced back to oogenesis, to the polarity of the egg chamber. A few early-acting genes, K10, top, grk and cni, have been identified which are assumed to function in a signal transduction process between the germline oocyte and the somatic follicle cells,(More)
Like most organisms, Drosophila embryos develop in relation to two orthogonal axes, the anteroposterior and dorsoventral. These two axes are established by four independent systems of maternal information. Mutations in any system disrupt either the anteroposterior or the dorsoventral patterning of the embryo but never affect the orthogonal orientation of(More)
Embryonic pattern formation has been studied extensively in many organisms. In Drosophila, the powerful combination of genetics cytoplasm transplantation experiments, as well as recent molecular data, have helped to elucidate the mechanisms responsible for the establishment of embryonic polarity. A small number of genes, most of them maternally expressed,(More)
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