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Страница 1 от 343 резултата
Role of tyrosine in sea snake neurotoxin.
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Vegetalization of sea urchin embryos by treatment with tyrosine.
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The protein tyrosine kinases of the sea urchin Anthocidaris crassispina.
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In order to know the function of protein tyrosine kinases (PTKs) in the development of sea urchin embryos, we performed reverse transcription-polymerase chain reaction (RT-PCR) to obtain partial cDNA fragments for PTK genes using primers to highly conserved regions of the PTK family. A total of
Flipping chromosomes in deep-sea archaea.
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One of the major mechanisms driving the evolution of all organisms is genomic rearrangement. In hyperthermophilic Archaea of the order Thermococcales, large chromosomal inversions occur so frequently that even closely related genomes are difficult to align. Clearly not resulting from the native
Scaffolding protein Gab2 mediates fibroblast transformation by the SEA tyrosine kinase.
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Transformation of fibroblasts by V-SEA involves activation of the ERK and phosphatidylinositol 3-kinase (PI3K) pathways. Effector proteins that are key mediators of the ERK and PI3K pathways, namely Grb2, the tyrosine phosphatase, SHP2 and PI3K, interact with the two phosphotyrosines found in the
A first glance into the nutritional properties of the sea cucumber Parastichopus regalis from the Mediterranean Sea (SE Spain).
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This work reports for the first time the nutritional profile, including proximate chemical composition, amino acids, fatty acids and minerals of Parastichopus regalis from the Mediterranean Sea (SE Spain). The studied species had a high moisture content, moderate protein and low lipid levels. The
Two new retroviral onc genes, sea and jun.
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Avian leukemia virus S13 induces erythroblastosis, granulocytic leukemia, fibrosarcoma, anemia, and endothelial neoplasia. It transforms chick embryo fibroblasts and primitive erythroid cells in culture and is defective in replication. Its onc gene, sea, is expressed as transformation specific
Detection of phospholipase Cgamma in sea urchin eggs.
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Phosphorylation on tyrosine and turnover of polyphosphoinositide metabolism are rapidly stimulated after fertilization. However, the interconnection between these pathways remains to be determined. In the present paper it is demonstrated that eggs of two different sea urchin species contain tyrosine
Analysis of the vegetalizing action of tyrosine on the sea urchin embryo.
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Delamination and tyrosine phosphorylation of SUp62 during early embryogenesis of sea urchin.
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Membrane events of fertilization in the sea urchin.
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Four important events of fertilization in the sea urchin are: 1) the acrosome reaction of the sperm, 2) sperm-egg fusion, 3) the cortical reaction of the egg, and 4) the formation of the fertilization coat. The acrosome reaction is triggered by contact of the sperm with the jelly coat, a complex
Protein tyrosine kinase-dependent release of intracellular calcium in the sea urchin egg.
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The aminoguanide, methylglyoxal bis(guanylhydrazone) (MGBG), was shown to stimulate phosphorylation of RR-SRC, a synthetic protein tyrosine kinase (PTK) substrate, and different levels of tyrosyl phosphorylation of endogenous proteins in a sea urchin egg membrane-cortex preparation. Stimulating
Phorbol ester treatment stimulates tyrosine phosphorylation of a sea urchin egg cortex protein.
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Fertilization of the sea urchin egg results in the phosphorylation, on tyrosine, of a high molecular weight protein localized in the egg cortex. In the present study, treatment of unfertilized eggs with the phorbol ester 12-O-tetradecanoylphorbol 13-acetate stimulated tyrosine phosphorylation of the
A rapid change in phosphorylation on tyrosine accompanies fertilization of sea urchin eggs.
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Alterations in protein phosphorylation, particularly phosphorylation on tyrosine, frequently accompany cell change and are important agents in the cascades initiated by extracellular signals. This paper examines whether the activation of the sea urchin egg at fertilization involves an early and
Protein tyrosine phosphorylation during sea urchin fertilization: microtubule dynamics require tyrosine kinase activity.
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Protein tyrosine phosphorylation plays an important role in cell growth, mitosis, and tumorigenesis. It has also been implicated in meiotic maturation and fertilization. We have used anti-phosphotyrosine immunofluorescence and immunoblotting to identify sperm and egg proteins which are
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