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  • Amino Acid Sequence  (2)
  • Animals  (2)
  • Hepatic melanin
  • 1990-1994  (2)
  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural study on hepatic melanin in Xenopus laevis (1977)
    Springer
    Cell & tissue research 185 (1977), S. 331-337 
    Details
    ISSN: 1432-0878
    Keywords: Ultrastructure ; Hepatic melanin ; Sex ; Age ; Xenopus laevis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The livers of Xenopus laevis, grouped by chronological age (0.5,2 and 3 yrs), were studied electron microscopically. Ultrastructurally most of the melanin granules in the mature female liver showed an-internal structure similar to the melanin granules of the oocytes. The hepatic melanin granules of immature females and of all males were pleomorphic and failed to show the characteristic internal structure similar to those of the oocytes. The oocyte is the probable source of most of the hepatic melanin of the mature female.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220293
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    Paper (German National Licenses)
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  • 2
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    Identification of small clusters of divergent amino acids that mediate the opposing effects of ras and Krev-1 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-13
    Description: Krev-1 is an anti-oncogene that was originally identified by its ability to induce morphologic reversion of ras-transformed cells that continue to express the ras gene. The Krev-1-encoded protein is structurally related to Ras proteins. The biological activities of a series of ras-Krev-1 chimeras were studied to test the hypothesis that Krev-1 may directly interfere with a ras function. The ras-specific and Krev-1-specific amino acids immediately surrounding residues 32 to 44, which are identical between the two proteins, determined whether the protein induced cellular transformation or suppressed ras transformation. Because this region in Ras proteins has been implicated in effector function, the results suggest that Krev-1 suppresses ras-induced transformation by interfering with interaction of Ras with its effector.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, K -- Noda, M -- Vass, W C -- Papageorge, A G -- Lowy, D R -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):162-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular Oncology, National Cancer Institute, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2115210" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acids/*physiology ; Animals ; Cell Transformation, Neoplastic/*genetics ; Chimera ; GTP-Binding Proteins/*genetics ; *Gene Expression Regulation, Neoplastic ; *Genes, ras ; Harvey murine sarcoma virus/genetics ; Molecular Sequence Data ; Mutation ; Restriction Mapping ; *Suppression, Genetic ; rap GTP-Binding Proteins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    cDNA cloning and interferon gamma down-regulation of proteasomal subunits X and Y (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-08-26
    Description: Proteasomes are the proteolytic complex responsible for major histocompatibility complex (MHC) class I-restricted antigen presentation. Interferon gamma treatment increases expression MHC-encoded LMP2 and LMP7 subunits of the proteasome and decreases expression of two proteasome subunits, named X and Y, which alters the proteolytic specificity of proteasomes. Molecular cloning of complementary DNAs encoding X and Y showed that their proteins are proteasomal subunits with high amino acid similarity to LMP7 and LMP2, respectively. Thus, interferon gamma may induce subunit replacements of X and Y by LMP7 and LMP2, respectively, producing proteasomes perhaps more appropriate for the immunological processing of endogenous antigens.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Akiyama, K -- Yokota, K -- Kagawa, S -- Shimbara, N -- Tamura, T -- Akioka, H -- Nothwang, H G -- Noda, C -- Tanaka, K -- Ichihara, A -- New York, N.Y. -- Science. 1994 Aug 26;265(5176):1231-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Urology, School of Medicine, University of Tokushima, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8066462" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Cloning, Molecular ; *Cysteine Endopeptidases ; DNA, Complementary/genetics ; *Down-Regulation ; Endopeptidases/chemistry/genetics ; Humans ; Interferon-gamma/*pharmacology ; Major Histocompatibility Complex ; Molecular Sequence Data ; *Multienzyme Complexes ; *Proteasome Endopeptidase Complex ; Proteins/chemistry/*genetics/metabolism ; Sequence Homology, Amino Acid ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Target velocity signals of visual tracking in vermal Purkinje cells of the monkey (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-17
    Description: Discharges of Purkinje cells were recorded from the vermis, lobules VI and VII, of a monkey trained to track a visual target. When the monkey tracked a sinusoidally oscillating target, cellular activity changes in phase with the velocity signal of the eye movement. When the monkey fixated a stationary point, almost identical modulation in activity occurred, reflecting the velocity signal of the motion of the retinal image of the target. The data suggest that the vermis participates in the control of smooth pursuit eye movements by providing the oculomotor system with the actual target velocity information which is the sum of eye velocity and retinal image velocity signals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kase, M -- Noda, H -- Suzuki, D A -- Miller, D C -- New York, N.Y. -- Science. 1979 Aug 17;205(4407):717-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/111350" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; *Eye Movements ; Haplorhini ; Motion Perception/physiology ; Proprioception ; Purkinje Cells/*physiology ; Visual Perception/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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