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  • Articles  (215)
  • Amino Acid Sequence  (215)
  • American Association for the Advancement of Science (AAAS)  (215)
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  • Articles  (215)
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  • American Association for the Advancement of Science (AAAS)  (215)
  • American Geophysical Union
  • American Meteorological Society
  • American Physical Society (APS)
  • Copernicus
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  • 2010-2014
  • 2000-2004  (92)
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  • 1
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    Unfolding pathways of individual bacteriorhodopsins (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-02-07
    Description: Atomic force microscopy and single-molecule force spectroscopy were combined to image and manipulate purple membrane patches from Halobacterium salinarum. Individual bacteriorhodopsin molecules were first localized and then extracted from the membrane; the remaining vacancies were imaged again. Anchoring forces between 100 and 200 piconewtons for the different helices were found. Upon extraction, the helices were found to unfold. The force spectra revealed the individuality of the unfolding pathways. Helices G and F as well as helices E and D always unfolded pairwise, whereas helices B and C occasionally unfolded one after the other. Experiments with cleaved loops revealed the origin of the individuality: stabilization of helix B by neighboring helices.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oesterhelt, F -- Oesterhelt, D -- Pfeiffer, M -- Engel, A -- Gaub, H E -- Muller, D J -- New York, N.Y. -- Science. 2000 Apr 7;288(5463):143-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CeNS and Lehrstuhl fur angewandte Physik, Ludwig Maximilians-Universitat Munchen, Amalienstrasse 54, 80799 Munchen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10753119" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacteriorhodopsins/*chemistry/genetics ; Cysteine/chemistry ; Halobacterium salinarum/*chemistry ; Membrane Proteins/*chemistry/genetics ; *Microscopy, Atomic Force ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Protein Conformation ; Protein Denaturation ; *Protein Folding ; Protein Structure, Secondary ; Purple Membrane/*chemistry ; Serine Endopeptidases/metabolism ; Spectrum Analysis
    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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  • 2
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    Structural genomics offers high-speed look at proteins (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-02-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Service, R F -- New York, N.Y. -- Science. 2000 Mar 17;287(5460):1954-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10755949" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Biotechnology ; Computer Simulation ; Crystallography, X-Ray ; *Drug Design ; Humans ; Models, Molecular ; Private Sector ; *Protein Conformation ; Protein Folding ; Proteins/*chemistry/*genetics/physiology ; Proteome ; Public Sector ; Research Support as Topic
    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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  • 3
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    Structural basis of transcription: RNA polymerase II at 2.8 angstrom resolution (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-21
    Description: Structures of a 10-subunit yeast RNA polymerase II have been derived from two crystal forms at 2.8 and 3.1 angstrom resolution. Comparison of the structures reveals a division of the polymerase into four mobile modules, including a clamp, shown previously to swing over the active center. In the 2.8 angstrom structure, the clamp is in an open state, allowing entry of straight promoter DNA for the initiation of transcription. Three loops extending from the clamp may play roles in RNA unwinding and DNA rewinding during transcription. A 2.8 angstrom difference Fourier map reveals two metal ions at the active site, one persistently bound and the other possibly exchangeable during RNA synthesis. The results also provide evidence for RNA exit in the vicinity of the carboxyl-terminal repeat domain, coupling synthesis to RNA processing by enzymes bound to this domain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cramer, P -- Bushnell, D A -- Kornberg, R D -- GM49985/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 8;292(5523):1863-76. Epub 2001 Apr 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305-5126, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11313498" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Conserved Sequence ; Crystallography, X-Ray ; DNA, Fungal/chemistry/metabolism ; Fourier Analysis ; Hydrogen Bonding ; Magnesium/metabolism ; Metals/metabolism ; Models, Molecular ; Molecular Sequence Data ; Promoter Regions, Genetic ; Protein Conformation ; Protein Structure, Quaternary ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; RNA Polymerase II/*chemistry/*metabolism ; RNA Processing, Post-Transcriptional ; RNA, Fungal/biosynthesis/chemistry/metabolism ; RNA, Messenger/biosynthesis/chemistry/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Transcription Factors/metabolism ; *Transcription, Genetic
    Print ISSN: 0036-8075
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  • 4
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    Translating the histone code (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-08-11
    Description: Chromatin, the physiological template of all eukaryotic genetic information, is subject to a diverse array of posttranslational modifications that largely impinge on histone amino termini, thereby regulating access to the underlying DNA. Distinct histone amino-terminal modifications can generate synergistic or antagonistic interaction affinities for chromatin-associated proteins, which in turn dictate dynamic transitions between transcriptionally active or transcriptionally silent chromatin states. The combinatorial nature of histone amino-terminal modifications thus reveals a "histone code" that considerably extends the information potential of the genetic code. We propose that this epigenetic marking system represents a fundamental regulatory mechanism that has an impact on most, if not all, chromatin-templated processes, with far-reaching consequences for cell fate decisions and both normal and pathological development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jenuwein, T -- Allis, C D -- GM53512/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Aug 10;293(5532):1074-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research Institute of Molecular Pathology (IMP) at the Vienna Biocenter, Dr. Bohrgasse 7, A-1030 Vienna, Austria. jenuwein@nt.imp.univie.ac.at〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11498575" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation ; Amino Acid Sequence ; Animals ; Chromatin/chemistry/metabolism/ultrastructure ; *Gene Expression Regulation ; *Gene Silencing ; Genomic Imprinting ; Histones/chemistry/genetics/*metabolism ; Methylation ; Molecular Sequence Data ; Phosphorylation ; Protein Structure, Tertiary ; Transcription, Genetic ; Transcriptional Activation
    Print ISSN: 0036-8075
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  • 5
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    A transcriptional switch mediated by cofactor methylation (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-11-10
    Description: We describe a molecular switch based on the controlled methylation of nucleosome and the transcriptional cofactors, the CREB-binding proteins (CBP)/p300. The CBP/p300 methylation site is localized to an arginine residue that is essential for stabilizing the structure of the KIX domain, which mediates CREB recruitment. Methylation of KIX by coactivator-associated arginine methyltransferase 1 (CARM1) blocks CREB activation by disabling the interaction between KIX and the kinase inducible domain (KID) of CREB. Thus, CARM1 functions as a corepressor in cyclic adenosine monophosphate signaling pathway via its methyltransferase activity while acting as a coactivator for nuclear hormones. These results provide strong in vivo and in vitro evidence that histone methylation plays a key role in hormone-induced gene activation and define cofactor methylation as a new regulatory mechanism in hormone signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, W -- Chen, H -- Du, K -- Asahara, H -- Tini, M -- Emerson, B M -- Montminy, M -- Evans, R M -- 9R01DK57978/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2001 Dec 21;294(5551):2507-11. Epub 2001 Nov 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gene Expression Laboratory, Department of Biological Chemistry, University of California Davis Cancer Center/Basic Science, Sacramento, CA 95817, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11701890" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyltransferases/metabolism ; Amino Acid Sequence ; Animals ; Apoptosis ; Cell Line ; Cyclic AMP Response Element-Binding Protein/metabolism ; Dimerization ; E1A-Associated p300 Protein ; *Gene Expression Regulation ; Genes, Reporter ; Histone Acetyltransferases ; Histones/metabolism ; Methylation ; Molecular Sequence Data ; Nerve Growth Factor/pharmacology ; Nuclear Proteins/chemistry/*metabolism ; PC12 Cells ; Protein Structure, Tertiary ; Protein-Arginine N-Methyltransferases/*metabolism ; Rats ; Receptors, Retinoic Acid/*metabolism ; Recombinant Fusion Proteins/metabolism ; Retinoid X Receptors ; *Saccharomyces cerevisiae Proteins ; Signal Transduction ; Somatostatin/genetics ; Trans-Activators/chemistry/*metabolism ; Transcription Factors/metabolism ; *Transcription, Genetic ; Transcriptional Activation ; Transfection ; Tretinoin/metabolism/pharmacology
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  • 6
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    Pot1, the putative telomere end-binding protein in fission yeast and humans (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-05-12
    Description: Telomere proteins from ciliated protozoa bind to the single-stranded G-rich DNA extensions at the ends of macronuclear chromosomes. We have now identified homologous proteins in fission yeast and in humans. These Pot1 (protection of telomeres) proteins each bind the G-rich strand of their own telomeric repeat sequence, consistent with a direct role in protecting chromosome ends. Deletion of the fission yeast pot1+ gene has an immediate effect on chromosome stability, causing rapid loss of telomeric DNA and chromosome circularization. It now appears that the protein that caps the ends of chromosomes is widely dispersed throughout the eukaryotic kingdom.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baumann, P -- Cech, T R -- New York, N.Y. -- Science. 2001 May 11;292(5519):1171-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11349150" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Binding Sites ; Chromosome Segregation/genetics ; Chromosomes, Fungal/genetics/metabolism ; Cloning, Molecular ; DNA/genetics/metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Electrophoresis, Gel, Pulsed-Field ; Female ; Gene Deletion ; Gene Expression Profiling ; Heterozygote ; Humans ; Molecular Sequence Data ; Ovary/metabolism ; Phenotype ; RNA, Messenger/analysis/genetics ; Schizosaccharomyces/*genetics ; Schizosaccharomyces pombe Proteins ; Sequence Alignment ; Substrate Specificity ; Telomere/genetics/*metabolism ; *Telomere-Binding Proteins
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  • 7
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    Stimulation of RNA polymerase II elongation by hepatitis delta antigen (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-02
    Description: Transcription elongation by RNA polymerase II (RNAPII) is negatively regulated by the human factors DRB-sensitivity inducing factor (DSIF) and negative elongation factor (NELF). A 66-kilodalton subunit of NELF (NELF-A) shows limited sequence similarity to hepatitis delta antigen (HDAg), the viral protein required for replication of hepatitis delta virus (HDV). The host RNAPII has been implicated in HDV replication, but the detailed mechanism and the role of HDAg in this process are not understood. We show that HDAg binds RNAPII directly and stimulates transcription by displacing NELF and promoting RNAPII elongation. These results suggest that HDAg may regulate RNAPII elongation during both cellular messenger RNA synthesis and HDV RNA replication.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yamaguchi, Y -- Filipovska, J -- Yano, K -- Furuya, A -- Inukai, N -- Narita, T -- Wada, T -- Sugimoto, S -- Konarska, M M -- Handa, H -- New York, N.Y. -- Science. 2001 Jul 6;293(5527):124-7. Epub 2001 May 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Frontier Collaborative Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11387440" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Consensus Sequence/genetics ; Enzyme Activation ; HeLa Cells ; Hepatitis Antigens/chemistry/*metabolism ; *Hepatitis Delta Virus/chemistry/genetics/metabolism ; Hepatitis delta Antigens ; Humans ; Molecular Sequence Data ; Protein Binding ; Protein Subunits ; RNA Polymerase II/*metabolism ; RNA, Viral/biosynthesis/genetics ; Sequence Alignment ; Templates, Genetic ; Transcription Factors/antagonists & inhibitors/chemistry/metabolism ; *Transcription, Genetic ; Virus Replication
    Print ISSN: 0036-8075
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  • 8
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    Clinical resistance to STI-571 cancer therapy caused by BCR-ABL gene mutation or amplification (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-26
    Description: Clinical studies with the Abl tyrosine kinase inhibitor STI-571 in chronic myeloid leukemia demonstrate that many patients with advanced stage disease respond initially but then relapse. Through biochemical and molecular analysis of clinical material, we find that drug resistance is associated with the reactivation of BCR-ABL signal transduction in all cases examined. In six of nine patients, resistance was associated with a single amino acid substitution in a threonine residue of the Abl kinase domain known to form a critical hydrogen bond with the drug. This substitution of threonine with isoleucine was sufficient to confer STI-571 resistance in a reconstitution experiment. In three patients, resistance was associated with progressive BCR-ABL gene amplification. These studies provide evidence that genetically complex cancers retain dependence on an initial oncogenic event and suggest a strategy for identifying inhibitors of STI-571 resistance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gorre, M E -- Mohammed, M -- Ellwood, K -- Hsu, N -- Paquette, R -- Rao, P N -- Sawyers, C L -- GM07185/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Aug 3;293(5531):876-80. Epub 2001 Jun 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11423618" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Antineoplastic Agents/metabolism/pharmacology/therapeutic use ; Base Sequence ; Benzamides ; Blast Crisis/genetics ; Cell Line ; Drug Resistance, Neoplasm/genetics ; Fusion Proteins, bcr-abl/*metabolism ; Gene Amplification ; *Genes, abl ; Humans ; Hydrogen Bonding ; Imatinib Mesylate ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive/*drug therapy/*genetics ; Molecular Sequence Data ; Philadelphia Chromosome ; Phosphorylation ; Piperazines/metabolism/*pharmacology/therapeutic use ; Point Mutation ; Protein Structure, Tertiary ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-abl/antagonists & ; inhibitors/chemistry/*genetics/metabolism ; Proto-Oncogene Proteins c-crk ; Pyrimidines/metabolism/*pharmacology/therapeutic use ; Recurrence ; Signal Transduction
    Print ISSN: 0036-8075
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  • 9
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    A p53 amino-terminal nuclear export signal inhibited by DNA damage-induced phosphorylation (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-09
    Description: The p53 protein is present in low amounts in normally growing cells and is activated in response to physiological insults. MDM2 regulates p53 either through inhibiting p53's transactivating function in the nucleus or by targeting p53 degradation in the cytoplasm. We identified a previously unknown nuclear export signal (NES) in the amino terminus of p53, spanning residues 11 to 27 and containing two serine residues phosphorylated after DNA damage, which was required for p53 nuclear export in colloboration with the carboxyl-terminal NES. Serine-15-phosphorylated p53 induced by ultraviolet irradiation was not exported. Thus, DNA damage-induced phosphorylation may achieve optimal p53 activation by inhibiting both MDM2 binding to, and the nuclear export of, p53.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Y -- Xiong, Y -- CA65572/CA/NCI NIH HHS/ -- K01 CA087580/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 8;292(5523):1910-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lineberger Comprehensive Cancer Center, Department of Biochemistry and Biophysics, and Program in Molecular Biology and Biotechnology, University of North Carolina at Chapel Hill, NC 27599-7295, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11397945" target="_blank"〉PubMed〈/a〉
    Keywords: Active Transport, Cell Nucleus ; Amino Acid Sequence ; Animals ; Cell Fusion ; Cell Line ; Cell Nucleus/*metabolism ; Cells, Cultured ; Cytoplasm/metabolism ; *DNA Damage ; Mice ; Molecular Sequence Data ; Mutation ; *Nuclear Proteins ; Phosphorylation ; Phosphoserine/metabolism ; *Protein Sorting Signals ; Protein Structure, Tertiary ; Proteins/genetics/metabolism ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-mdm2 ; Recombinant Fusion Proteins/metabolism ; Transfection ; Tumor Suppressor Protein p14ARF ; Tumor Suppressor Protein p53/*chemistry/genetics/*metabolism ; Ubiquitins/metabolism ; Ultraviolet Rays
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  • 10
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    Regulation of vegetative phase change in Arabidopsis thaliana by cyclophilin 40 (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-03-27
    Description: During its development, a plant shoot progresses from a juvenile to an adult phase of vegetative growth and from a reproductively incompetent to a reproductively competent state. In Arabidopsis, loss-of-function mutations in SQUINT (SQN) reduced the number of juvenile leaves and had subtle effects on inflorescence morphology but had no effect on flowering time or on reproductive competence. SQN encodes the Arabidopsis homolog of cyclophilin 40 (CyP40), a protein found in association with the Hsp90 chaperone complex in yeast, mammals, and plants. Thus, in Arabidopsis, CyP40 is specifically required for the vegetative but not the reproductive maturation of the shoot.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berardini, T Z -- Bollman, K -- Sun, H -- Poethig, R S -- R01-GM1893-04/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2001 Mar 23;291(5512):2405-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, PA 19104-6018, USA. spoethig@sas.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11264535" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/anatomy & histology/*genetics/*growth & development/physiology ; Carrier Proteins/chemistry/genetics/physiology ; Chromosome Mapping ; *Cyclophilins ; Exons ; Gene Expression Regulation, Plant ; Genes, Plant ; Heat-Shock Proteins/genetics ; Molecular Sequence Data ; Mutation ; Peptidylprolyl Isomerase/chemistry/genetics/physiology ; Phenotype ; Plant Leaves/anatomy & histology/growth & development ; Plant Shoots/growth & development/physiology ; Reproduction ; Sequence Alignment ; Temperature
    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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