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  • Articles  (5,353)
  • Organic Chemistry  (2,690)
  • Inorganic Chemistry  (1,777)
  • Molecular Sequence Data  (886)
  • 1995-1999  (5,353)
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  • Articles  (5,353)
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  • 1
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    Structural basis of Smad2 recognition by the Smad anchor for receptor activation (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-30
    Description: The Smad proteins mediate transforming growth factor-beta (TGFbeta) signaling from the transmembrane serine-threonine receptor kinases to the nucleus. The Smad anchor for receptor activation (SARA) recruits Smad2 to the TGFbeta receptors for phosphorylation. The crystal structure of a Smad2 MH2 domain in complex with the Smad-binding domain (SBD) of SARA has been determined at 2.2 angstrom resolution. SARA SBD, in an extended conformation comprising a rigid coil, an alpha helix, and a beta strand, interacts with the beta sheet and the three-helix bundle of Smad2. Recognition between the SARA rigid coil and the Smad2 beta sheet is essential for specificity, whereas interactions between the SARA beta strand and the Smad2 three-helix bundle contribute significantly to binding affinity. Comparison of the structures between Smad2 and a comediator Smad suggests a model for how receptor-regulated Smads are recognized by the type I receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, G -- Chen, Y G -- Ozdamar, B -- Gyuricza, C A -- Chong, P A -- Wrana, J L -- Massague, J -- Shi, Y -- CA85171/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):92-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10615055" target="_blank"〉PubMed〈/a〉
    Keywords: *Activin Receptors, Type I ; Amino Acid Sequence ; Binding Sites ; Carrier Proteins/*chemistry/*metabolism ; Crystallography, X-Ray ; DNA-Binding Proteins/*chemistry/genetics/*metabolism ; Hydrogen Bonding ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Phosphorylation ; Point Mutation ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein-Serine-Threonine Kinases/chemistry/genetics/metabolism ; Receptors, Transforming Growth Factor beta/chemistry/genetics/metabolism ; Recombinant Fusion Proteins/chemistry/metabolism ; Signal Transduction ; Smad2 Protein ; Trans-Activators/*chemistry/genetics/*metabolism ; Zinc Fingers
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 2
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    A mammalian H+ channel generated through alternative splicing of the NADPH oxidase homolog NOH-1 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-30
    Description: Voltage-gated proton (H+) channels are found in many human and animal tissues and play an important role in cellular defense against acidic stress. However, a molecular identification of these unique ion conductances has so far not been achieved. A 191-amino acid protein is described that, upon heterologous expression, has properties indistinguishable from those of native H+ channels. This protein is generated through alternative splicing of messenger RNA derived from the gene NOH-1 (NADPH oxidase homolog 1, where NADPH is the reduced form of nicotinamide adenine dinucleotide phosphate).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Banfi, B -- Maturana, A -- Jaconi, S -- Arnaudeau, S -- Laforge, T -- Sinha, B -- Ligeti, E -- Demaurex, N -- Krause, K H -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):138-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology of Aging Laboratory, Department of Geriatrics, Geneva University Hospitals, Geneva Medical School, CH-1211 Geneva 4, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10615049" target="_blank"〉PubMed〈/a〉
    Keywords: *Alternative Splicing ; Amino Acid Sequence ; Cell Line ; Cytosol/metabolism ; Electric Conductivity ; Electron Transport ; Expressed Sequence Tags ; Humans ; Hydrogen/*metabolism ; Hydrogen-Ion Concentration ; Ion Channel Gating ; Ion Channels/chemistry/*genetics/metabolism ; Membrane Glycoproteins/chemistry/*genetics ; Molecular Sequence Data ; NADPH Oxidase/chemistry/*genetics ; Patch-Clamp Techniques ; Protons ; Transfection ; Tumor Cells, Cultured ; Zinc/pharmacology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Posttranscriptional gene silencing in Neurospora by a RecQ DNA helicase (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: The phenomenon of posttranscriptional gene silencing (PTGS), which occurs when a transgene is introduced into a cell, is poorly understood. Here, the qde-3 gene, which is required for the activation and maintenance of gene silencing in the fungus Neurospora crassa, was isolated. Sequence analysis revealed that the qde-3 gene belongs to the RecQ DNA helicase family. The QDE3 protein may function in the DNA-DNA interaction between introduced transgenes or with an endogenous gene required for gene-silencing activation. In animals, genes that are homologous to RecQ protein, such as the human genes for Bloom's syndrome and Werner's syndrome, may also function in PTGS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cogoni, C -- Macino, G -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2342-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dipartimento di Biotecnologie Cellulari ed Ematologia, Sezione di Genetica Molecolare, Universita di Roma La Sapienza, Viale Regina Elena, 324, 00161 Roma, Italy. carlo@bce.med.uniroma1.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600745" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry/genetics/*metabolism ; Amino Acid Sequence ; Bloom Syndrome/genetics ; Camptothecin/pharmacology ; DNA Helicases/chemistry/genetics/*metabolism ; DNA, Fungal/metabolism ; Enzyme Inhibitors/pharmacology ; Etoposide/pharmacology ; *Fungal Proteins ; *Gene Silencing ; Genes, Fungal ; Genetic Complementation Test ; Humans ; Molecular Sequence Data ; Molecular Weight ; Mutagenesis, Insertional ; Neurospora crassa/drug effects/enzymology/*genetics ; RecQ Helicases ; Sequence Alignment ; Transcription, Genetic ; Transgenes ; Werner Syndrome/genetics
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Binding of transcription termination protein nun to nascent RNA and template DNA (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: The amino-terminal arginine-rich motif of coliphage HK022 Nun binds phage lambda nascent transcript, whereas the carboxyl-terminal domain interacts with RNA polymerase (RNAP) and blocks transcription elongation. RNA binding is inhibited by zinc (Zn2+) and stimulated by Escherichia coli NusA. To study these interactions, the Nun carboxyl terminus was extended by a cysteine residue conjugated to a photochemical cross-linker. The carboxyl terminus contacted NusA and made Zn2+-dependent intramolecular contacts. When Nun was added to a paused transcription elongation complex, it cross-linked to the DNA template. Nun may arrest transcription by anchoring RNAP to DNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Watnick, R S -- Gottesman, M E -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2337-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics and Institute of Cancer Research, Columbia University, New York, NY 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600743" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Azides ; Bacterial Proteins/metabolism ; Bacteriophage lambda/genetics/physiology ; Cross-Linking Reagents ; DNA, Viral/*metabolism ; DNA-Directed RNA Polymerases/metabolism ; Dithiothreitol/pharmacology ; Escherichia coli/enzymology/virology ; Escherichia coli Proteins ; Molecular Sequence Data ; *Peptide Elongation Factors ; Phenanthrolines/metabolism ; Protein Binding ; Pyridines ; RNA, Messenger/*metabolism ; RNA, Viral/metabolism ; Templates, Genetic ; Transcription Factors/chemistry/*metabolism ; *Transcription, Genetic ; Transcriptional Elongation Factors ; Viral Plaque Assay ; Viral Proteins/chemistry/*metabolism ; Zinc/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Crystal structure of Thermotoga maritima ribosome recycling factor: a tRNA mimic (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: Ribosome recycling factor (RRF), together with elongation factor G (EF-G), catalyzes recycling of ribosomes after one round of protein synthesis. The crystal structure of RRF was determined at 2.55 angstrom resolution. The protein has an unusual fold where domain I is a long three-helix bundle and domain II is a three-layer beta/alpha/beta sandwich. The molecule superimposes almost perfectly with a transfer RNA (tRNA) except that the amino acid-binding 3' end is missing. The mimicry suggests that RRF interacts with the posttermination ribosomal complex in a similar manner to a tRNA, leading to disassembly of the complex. The structural arrangement of this mimicry is entirely different from that of other cases of less pronounced mimicry of tRNA so far described.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selmer, M -- Al-Karadaghi, S -- Hirokawa, G -- Kaji, A -- Liljas, A -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2349-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biophysics, Center for Chemistry and Chemical Engineering, Lund University, Post Office Box 124, SE-22100 Lund, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600747" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Crystallography, X-Ray ; Models, Molecular ; *Molecular Mimicry ; Molecular Sequence Data ; Nucleic Acid Conformation ; Peptide Elongation Factor G/chemistry ; Protein Biosynthesis ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Proteins/*chemistry/*metabolism ; RNA, Bacterial/chemistry/metabolism ; RNA, Fungal/chemistry/metabolism ; RNA, Transfer/*chemistry/metabolism ; RNA, Transfer, Phe/chemistry/metabolism ; Ribosomal Proteins ; Ribosomes/*metabolism ; Sequence Alignment ; Thermotoga maritima/*chemistry/metabolism
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  • 6
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    Origin of the West Nile virus responsible for an outbreak of encephalitis in the northeastern United States (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: In late summer 1999, an outbreak of human encephalitis occurred in the northeastern United States that was concurrent with extensive mortality in crows (Corvus species) as well as the deaths of several exotic birds at a zoological park in the same area. Complete genome sequencing of a flavivirus isolated from the brain of a dead Chilean flamingo (Phoenicopterus chilensis), together with partial sequence analysis of envelope glycoprotein (E-glycoprotein) genes amplified from several other species including mosquitoes and two fatal human cases, revealed that West Nile (WN) virus circulated in natural transmission cycles and was responsible for the human disease. Antigenic mapping with E-glycoprotein-specific monoclonal antibodies and E-glycoprotein phylogenetic analysis confirmed these viruses as WN. This North American WN virus was most closely related to a WN virus isolated from a dead goose in Israel in 1998.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lanciotti, R S -- Roehrig, J T -- Deubel, V -- Smith, J -- Parker, M -- Steele, K -- Crise, B -- Volpe, K E -- Crabtree, M B -- Scherret, J H -- Hall, R A -- MacKenzie, J S -- Cropp, C B -- Panigrahy, B -- Ostlund, E -- Schmitt, B -- Malkinson, M -- Banet, C -- Weissman, J -- Komar, N -- Savage, H M -- Stone, W -- McNamara, T -- Gubler, D J -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2333-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, CO 80522, USA. rsl2@cdc.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600742" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/immunology ; Antibodies, Viral/immunology ; Base Sequence ; Bird Diseases/epidemiology/virology ; Birds/virology ; *Disease Outbreaks ; Encephalitis Viruses, Japanese/classification/genetics ; Fluorescent Antibody Technique, Indirect ; Genome, Viral ; Humans ; Molecular Sequence Data ; New England/epidemiology ; New York City/epidemiology ; Phylogeny ; Songbirds/virology ; Viral Envelope Proteins/chemistry/genetics/immunology ; West Nile Fever/*epidemiology/veterinary/*virology ; West Nile virus/*classification/*genetics/immunology/isolation & purification
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    Electronic ISSN: 1095-9203
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  • 7
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    Use of the cell wall precursor lipid II by a pore-forming peptide antibiotic (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: Resistance to antibiotics is increasing in some groups of clinically important pathogens. For instance, high vancomycin resistance has emerged in enterococci. Promising alternative antibiotics are the peptide antibiotics, abundant in host defense systems, which kill their targets by permeabilizing the plasma membrane. These peptides generally do not act via specific receptors and are active in the micromolar range. Here it is shown that vancomycin and the antibacterial peptide nisin Z use the same target: the membrane-anchored cell wall precursor Lipid II. Nisin combines high affinity for Lipid II with its pore-forming ability, thus causing the peptide to be highly active (in the nanomolar range).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Breukink, E -- Wiedemann, I -- van Kraaij, C -- Kuipers, O P -- Sahl, H G -- de Kruijff, B -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2361-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center of Biomembranes and Lipid Enzymology, Department of Biochemistry of Membranes, Institute for Biomembranes, Utrecht University, Padualaan 8, 3584 CH Utrecht, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600751" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anti-Bacterial Agents/metabolism/*pharmacology ; Cell Membrane/drug effects/metabolism ; Cell Membrane Permeability/drug effects ; Cell Wall/metabolism ; Dose-Response Relationship, Drug ; Membrane Lipids/metabolism ; Microbial Sensitivity Tests ; Micrococcus/*drug effects/metabolism ; Molecular Sequence Data ; Nisin/*analogs & derivatives/metabolism/pharmacology ; Peptides/pharmacology ; Peptidoglycan ; Polyisoprenyl Phosphate Oligosaccharides/*metabolism ; Vancomycin/pharmacology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Implication of tubby proteins as transcription factors by structure-based functional analysis (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-11
    Description: Tubby-like proteins (TULPs) are found in a broad range of multicellular organisms. In mammals, genetic mutation of tubby or other TULPs can result in one or more of three disease phenotypes: obesity (from which the name "tubby" is derived), retinal degeneration, and hearing loss. These disease phenotypes indicate a vital role for tubby proteins; however, no biochemical function has yet been ascribed to any member of this protein family. A structure-directed approach was employed to investigate the biological function of these proteins. The crystal structure of the core domain from mouse tubby was determined at a resolution of 1.9 angstroms. From primarily structural clues, experiments were devised, the results of which suggest that TULPs are a unique family of bipartite transcription factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boggon, T J -- Shan, W S -- Santagata, S -- Myers, S C -- Shapiro, L -- New York, N.Y. -- Science. 1999 Dec 10;286(5447):2119-25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural Biology Program, Department of Physiology and Biophysics, Ruttenberg Cancer Center, Mount Sinai School of Medicine of New York University, New York, NY 10029, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10591637" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Alternative Splicing ; Amino Acid Sequence ; Animals ; Cell Line ; Cell Nucleus/chemistry ; Crystallography, X-Ray ; DNA/metabolism ; Eye Proteins/*chemistry/genetics/*metabolism ; Humans ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Proteins/*chemistry/genetics/*metabolism ; Recombinant Proteins/chemistry/metabolism ; Sequence Alignment ; Transcription Factors/*chemistry/genetics/*metabolism ; Transcriptional Activation
    Print ISSN: 0036-8075
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  • 9
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    A pair of related genes with antagonistic roles in mediating flowering signals (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-03
    Description: Flowering in Arabidopsis is promoted via several interacting pathways. A photoperiod-dependent pathway relays signals from photoreceptors to a transcription factor gene, CONSTANS (CO), which activates downstream meristem identity genes such as LEAFY (LFY). FT, together with LFY, promotes flowering and is positively regulated by CO. Loss of FT causes delay in flowering, whereas overexpression of FT results in precocious flowering independent of CO or photoperiod. FT acts in part downstream of CO and mediates signals for flowering in an antagonistic manner with its homologous gene, TERMINAL FLOWER1 (TFL1).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kobayashi, Y -- Kaya, H -- Goto, K -- Iwabuchi, M -- Araki, T -- New York, N.Y. -- Science. 1999 Dec 3;286(5446):1960-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10583960" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/*genetics/*growth & development ; *Arabidopsis Proteins ; DNA-Binding Proteins/chemistry/*genetics/physiology ; *Gene Expression Regulation, Plant ; Genes, Plant ; MADS Domain Proteins ; Molecular Sequence Data ; Phenotype ; Photoperiod ; Plant Proteins/chemistry/*genetics/physiology ; Plant Structures/growth & development ; Plants, Genetically Modified ; Signal Transduction ; Transcription Factors/chemistry/*genetics/physiology ; Up-Regulation
    Print ISSN: 0036-8075
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  • 10
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    An essential role for BLNK in human B cell development (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-03
    Description: The signal transduction events that control the progenitor B cell (pro-B cell) to precursor B cell (pre-B cell) transition have not been well delineated. In evaluating patients with absent B cells, a male with a homozygous splice defect in the cytoplasmic adapter protein BLNK (B cell linker protein) was identified. Although this patient had normal numbers of pro-B cells, he had no pre-B cells or mature B cells, indicating that BLNK plays a critical role in orchestrating the pro-B cell to pre-B cell transition. The immune system and overall growth and development were otherwise normal in this patient, suggesting that BLNK function is highly specific.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Minegishi, Y -- Rohrer, J -- Coustan-Smith, E -- Lederman, H M -- Pappu, R -- Campana, D -- Chan, A C -- Conley, M E -- AI25129/AI/NIAID NIH HHS/ -- AI42787/AI/NIAID NIH HHS/ -- CA71516/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Dec 3;286(5446):1954-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Department of Hematology-Oncology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10583958" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Adult ; Agammaglobulinemia/*genetics/immunology ; Antigens, CD19/analysis ; Antigens, CD34/analysis ; B-Lymphocytes/*cytology ; Bone Marrow Cells/cytology ; Carrier Proteins/genetics/*physiology ; Cell Differentiation ; Chromosome Mapping ; Gene Rearrangement, B-Lymphocyte, Heavy Chain ; Hematopoietic Stem Cells/*cytology ; Humans ; Male ; Molecular Sequence Data ; *Phosphoproteins ; Point Mutation ; Protein-Tyrosine Kinases/genetics/physiology ; Reverse Transcriptase Polymerase Chain Reaction ; Signal Transduction
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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