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  • 1
    Publication Date: 2018-07-03
    Description: Maternal obesity has been reported to impair oocyte quality in mice, however, the underlying mechanisms remain unclear. In the present study, by conducting a comparative proteomic analysis, we identified a reduced expression of TIGAR (TP53-induced glycolysis and apoptosis regulator) protein in ovulated oocytes from high-fat diet (HFD)-fed mice. Specific depletion of TIGAR in mouse oocytes results in the marked elevation of reactive oxygen species (ROS) levels and the failure of meiotic apparatus assembly. Importantly, forced expression of TIGAR in HFD oocytes not only attenuates ROS production, but also partly prevents spindle disorganization and chromosome misalignment during meiosis. Meantime, we noted that TIGAR knockdown in oocytes induces a strong activation of autophagy, whereas overexpression of TIGAR significantly reduces the LC3 accumulation in HFD oocytes. By anti-oxidant treatment, we further demonstrated that such an autophagic response is dependent on the TIGAR-controlled ROS production. In summary, our data indicate a role for TIGAR in modulating redox homeostasis during oocyte maturation, and uncover that loss of TIGAR is a critical pathway mediating the effects of maternal obesity on oocyte quality.
    Print ISSN: 1535-9476
    Electronic ISSN: 1535-9484
    Topics: Biology , Medicine
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  • 2
    Publication Date: 2018-07-18
    Description: Shun Bai, Kaiqiang Fu, Huiqi Yin, Yiqiang Cui, Qiuling Yue, Wenbo Li, Le Cheng, Huanhuan Tan, Xiaofei Liu, Yueshuai Guo, Yingwen Zhang, Jie Xie, Wenxiu He, Yuanyuan Wang, Hua Feng, Changpeng Xin, Jinwen Zhang, Mingyan Lin, Bin Shen, Zheng Sun, Xuejiang Guo, Ke Zheng, and Lan Ye Transcription factors of the Sox protein family contain a DNA-binding HMG box and are key regulators of progenitor cell fate. Here, we report that expression of Sox30 is restricted to meiotic spermatocytes and postmeiotic haploids. Sox30 mutant males are sterile owing to spermiogenic arrest at the early round spermatid stage. Specifically, in the absence of Sox30, proacrosomic vesicles fail to form a single acrosomal organelle, and spermatids arrest at step 2-3. Although most Sox30 mutant spermatocytes progress through meiosis, accumulation of diplotene spermatocytes indicates a delayed or impaired transition from meiotic to postmeiotic stages. Transcriptome analysis of isolated stage-specific spermatogenic cells reveals that Sox30 controls a core postmeiotic gene expression program that initiates as early as the late meiotic cell stage. ChIP-seq analysis shows that Sox30 binds to specific DNA sequences in mouse testes, and its genomic occupancy correlates positively with expression of many postmeiotic genes including Tnp1 , Hils1 , Ccdc54 and Tsks . These results define Sox30 as a crucial transcription factor that controls the transition from a late meiotic to a postmeiotic gene expression program and subsequent round spermatid development.
    Keywords: Reproductive biology
    Print ISSN: 0950-1991
    Electronic ISSN: 1477-9129
    Topics: Biology
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  • 3
    Publication Date: 2018-08-02
    Description: Herein, the DNA strands containing 5'-(CGA) n and consecutive guanines are used to construct supramolecular DNA nanostructures that are size-controlled by pH values. Additionally, the introduction of thymine linkers within DNA nanostructures is necessary to maintain the stability of long-sized nanostructures. This work also demonstrates a method for accurately building DNA nanostructures.
    Keywords: biochemistry, supramolecular chemistry
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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  • 4
    Publication Date: 2018-01-03
    Description: Hypoxia contributes to pancreatic cancer progression and promotes its growth and invasion. Previous research principally focused on hypoxia-inducible factor-1 alpha (HIF-1α) and HIF-2α (HIF1A and EPAS1) as the major hypoxia-associated transcription factors in pancreatic cancer. However, the role of HIF-3α (HIF3A) has not been investigated. Therefore, HIF-1α, HIF-2α, and HIF-3α expression levels were measured under normoxic and hypoxic conditions. In addition, HIF-3α expression was measured in human pancreatic cancer tissue specimens and the impact of altered HIF-3α expression on cell invasion and migration was investigated in vitro and in vivo , as well as the underlying mechanisms. Under hypoxic conditions, HIF-3α expression was stimulated in pancreatic cancer cells to a greater degree than HIF-1α and HIF-2α expression. HIF-3α protein levels were also elevated in pancreatic cancer tissues and correlated with reduced survival and greater local invasion and distant metastasis, whereas knockdown of HIF-3α, under hypoxic conditions, suppressed pancreatic cancer cell invasion and migration. Under normoxia, HIF-3α overexpression promoted pancreatic cancer cell invasion and migration and stimulated F-actin polymerization. In summary, HIF-3α promotes pancreatic cancer cell invasion and metastasis in vivo and promotes pancreatic cancer cell invasion and metastasis by transcriptionally activating the RhoC–ROCK1 signaling pathway. Implications: HIF3α is overexpressed in pancreatic cancer, and targeting the HIF3α/RhoC–ROCK1 signaling pathway may be a novel therapeutic approach for the treatment of pancreatic cancer invasion and metastasis. Mol Cancer Res; 16(1); 124–34. ©2017 AACR .
    Print ISSN: 1541-7786
    Electronic ISSN: 1557-3125
    Topics: Medicine
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  • 5
    Publication Date: 2018-06-23
    Description: Introduction Paraquat (PQ) is a widely used herbicide which is inexpensive and easily accessible for people in rural areas. A small amount of PQ ingestion could be lethal, yet currently, the optimal treatment is still controversial. Extracorporeal therapies (ECTR) have been practised in PQ poisoning management, though limited evidence could be obtained to suggest its superiority over conservative therapy. Haemodialysis (HD) and haemoperfusion (HP) are most commonly used, while some institutions also choose HP–HD concurrent therapy. The object of the present trial is to investigate whether haemopurification therapy can reduce mortality compared with conservative therapy. Methods and analysis This is a planned single-centre, non-blinded, randomised controlled trial. Acute PQ poisoned adults who have orally ingested PQ within 24 hours would be recruited. A total of 360 patients would be recruited and randomly assigned to four groups, that is, HP, HD, concurrent HP–HD and control, at a 1:1:1:1 ratio. Subjects would be also stratified by their urine dithionite test results. Primary outcome is 28-day all-cause mortality. Secondary outcomes include survival time, all-cause mortality at the 3rd, 7th and 60th day, rate of major complications, Acute Physiologic and Chronic Health Evaluation score and Poisoning Severity Score, etc. Ethics and dissemination The protocol and informed consent documents have been approved by the Ethics Committee of The First Affiliated Hospital of Zhengzhou University in September 2017 (approval number: 2017-KY-10). The result of this trial would be submitted to peer-reviewed journal. Trial registration number NCT03314909 ; Pre-results.
    Keywords: Open access, Emergency medicine
    Electronic ISSN: 2044-6055
    Topics: Medicine
    Published by BMJ Publishing
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  • 6
    Publication Date: 2012-09-04
    Description: Macromolecular assemblies involving membrane proteins (MPs) serve vital biological roles and are prime drug targets in a variety of diseases. Large-scale affinity purification studies of soluble-protein complexes have been accomplished for diverse model organisms, but no global characterization of MP-complex membership has been described so far. Here we report a complete survey of 1,590 putative integral, peripheral and lipid-anchored MPs from Saccharomyces cerevisiae, which were affinity purified in the presence of non-denaturing detergents. The identities of the co-purifying proteins were determined by tandem mass spectrometry and subsequently used to derive a high-confidence physical interaction map encompassing 1,726 membrane protein-protein interactions and 501 putative heteromeric complexes associated with the various cellular membrane systems. Our analysis reveals unexpected physical associations underlying the membrane biology of eukaryotes and delineates the global topological landscape of the membrane interactome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Babu, Mohan -- Vlasblom, James -- Pu, Shuye -- Guo, Xinghua -- Graham, Chris -- Bean, Bjorn D M -- Burston, Helen E -- Vizeacoumar, Franco J -- Snider, Jamie -- Phanse, Sadhna -- Fong, Vincent -- Tam, Yuen Yi C -- Davey, Michael -- Hnatshak, Olha -- Bajaj, Navgeet -- Chandran, Shamanta -- Punna, Thanuja -- Christopolous, Constantine -- Wong, Victoria -- Yu, Analyn -- Zhong, Gouqing -- Li, Joyce -- Stagljar, Igor -- Conibear, Elizabeth -- Wodak, Shoshana J -- Emili, Andrew -- Greenblatt, Jack F -- MOP 81156/Canadian Institutes of Health Research/Canada -- MOP 64394/Canadian Institutes of Health Research/Canada -- MOP 82940/Canadian Institutes of Health Research/Canada -- England -- Nature. 2012 Sep 27;489(7417):585-9. doi: 10.1038/nature11354. Epub 2012 Sep 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Banting and Best Department of Medical Research, Donnelly Centre, 160 College Street, University of Toronto, Toronto, Ontario M5S 3E1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22940862" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Membrane/chemistry/metabolism ; Chitin Synthase/metabolism ; Detergents ; Endoplasmic Reticulum/metabolism ; Golgi Apparatus/metabolism ; Mass Spectrometry ; Membrane Proteins/analysis/chemistry/*metabolism ; Protein Binding ; Protein Interaction Mapping ; *Protein Interaction Maps ; Proteome/analysis/chemistry/metabolism ; Saccharomyces cerevisiae/chemistry/cytology/*metabolism ; Saccharomyces cerevisiae Proteins/analysis/chemistry/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2013-03-29
    Description: Bread wheat (Triticum aestivum, AABBDD) is one of the most widely cultivated and consumed food crops in the world. However, the complex polyploid nature of its genome makes genetic and functional analyses extremely challenging. The A genome, as a basic genome of bread wheat and other polyploid wheats, for example, T. turgidum (AABB), T. timopheevii (AAGG) and T. zhukovskyi (AAGGA(m)A(m)), is central to wheat evolution, domestication and genetic improvement. The progenitor species of the A genome is the diploid wild einkorn wheat T. urartu, which resembles cultivated wheat more extensively than do Aegilops speltoides (the ancestor of the B genome) and Ae. tauschii (the donor of the D genome), especially in the morphology and development of spike and seed. Here we present the generation, assembly and analysis of a whole-genome shotgun draft sequence of the T. urartu genome. We identified protein-coding gene models, performed genome structure analyses and assessed its utility for analysing agronomically important genes and for developing molecular markers. Our T. urartu genome assembly provides a diploid reference for analysis of polyploid wheat genomes and is a valuable resource for the genetic improvement of wheat.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ling, Hong-Qing -- Zhao, Shancen -- Liu, Dongcheng -- Wang, Junyi -- Sun, Hua -- Zhang, Chi -- Fan, Huajie -- Li, Dong -- Dong, Lingli -- Tao, Yong -- Gao, Chuan -- Wu, Huilan -- Li, Yiwen -- Cui, Yan -- Guo, Xiaosen -- Zheng, Shusong -- Wang, Biao -- Yu, Kang -- Liang, Qinsi -- Yang, Wenlong -- Lou, Xueyuan -- Chen, Jie -- Feng, Mingji -- Jian, Jianbo -- Zhang, Xiaofei -- Luo, Guangbin -- Jiang, Ying -- Liu, Junjie -- Wang, Zhaobao -- Sha, Yuhui -- Zhang, Bairu -- Wu, Huajun -- Tang, Dingzhong -- Shen, Qianhua -- Xue, Pengya -- Zou, Shenhao -- Wang, Xiujie -- Liu, Xin -- Wang, Famin -- Yang, Yanping -- An, Xueli -- Dong, Zhenying -- Zhang, Kunpu -- Zhang, Xiangqi -- Luo, Ming-Cheng -- Dvorak, Jan -- Tong, Yiping -- Wang, Jian -- Yang, Huanming -- Li, Zhensheng -- Wang, Daowen -- Zhang, Aimin -- Wang, Jun -- England -- Nature. 2013 Apr 4;496(7443):87-90. doi: 10.1038/nature11997. Epub 2013 Mar 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23535596" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Brachypodium/genetics ; Crops, Agricultural/classification/genetics ; Diploidy ; Genetic Markers/genetics ; Genome, Plant/*genetics ; Molecular Sequence Data ; Oryza/genetics ; Phylogeny ; Sorghum/genetics ; Synteny/genetics ; Triticum/classification/*genetics ; Zea mays/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2012-12-04
    Description: Ionic protein-lipid interactions are critical for the structure and function of membrane receptors, ion channels, integrins and many other proteins. However, the regulatory mechanism of these interactions is largely unknown. Here we show that Ca(2+) can bind directly to anionic phospholipids and thus modulate membrane protein function. The activation of T-cell antigen receptor-CD3 complex (TCR), a key membrane receptor for adaptive immunity, is regulated by ionic interactions between positively charged CD3epsilon/zeta cytoplasmic domains (CD3(CD)) and negatively charged phospholipids in the plasma membrane. Crucial tyrosines are buried in the membrane and are largely protected from phosphorylation in resting T cells. It is not clear how CD3(CD) dissociates from the membrane in antigen-stimulated T cells. The antigen engagement of even a single TCR triggers a Ca(2+) influx and TCR-proximal Ca(2+) concentration is higher than the average cytosolic Ca(2+) concentration. Our biochemical, live-cell fluorescence resonance energy transfer and NMR experiments showed that an increase in Ca(2+) concentration induced the dissociation of CD3(CD) from the membrane and the solvent exposure of tyrosine residues. As a consequence, CD3 tyrosine phosphorylation was significantly enhanced by Ca(2+) influx. Moreover, when compared with wild-type cells, Ca(2+) channel-deficient T cells had substantially lower levels of CD3 phosphorylation after stimulation. The effect of Ca(2+) on facilitating CD3 phosphorylation is primarily due to the charge of this ion, as demonstrated by the fact that replacing Ca(2+) with the non-physiological ion Sr(2+) resulted in the same feedback effect. Finally, (31)P NMR spectroscopy showed that Ca(2+) bound to the phosphate group in anionic phospholipids at physiological concentrations, thus neutralizing the negative charge of phospholipids. Rather than initiating CD3 phosphorylation, this regulatory pathway of Ca(2+) has a positive feedback effect on amplifying and sustaining CD3 phosphorylation and should enhance T-cell sensitivity to foreign antigens. Our study thus provides a new regulatory mechanism of Ca(2+) to T-cell activation involving direct lipid manipulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shi, Xiaoshan -- Bi, Yunchen -- Yang, Wei -- Guo, Xingdong -- Jiang, Yan -- Wan, Chanjuan -- Li, Lunyi -- Bai, Yibing -- Guo, Jun -- Wang, Yujuan -- Chen, Xiangjun -- Wu, Bo -- Sun, Hongbin -- Liu, Wanli -- Wang, Junfeng -- Xu, Chenqi -- England -- Nature. 2013 Jan 3;493(7430):111-5. doi: 10.1038/nature11699. Epub 2012 Dec 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23201688" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*metabolism/pharmacology ; Cell Membrane/metabolism ; Cytoplasm/metabolism ; Feedback, Physiological/drug effects ; Humans ; Jurkat Cells ; Lipid Bilayers/chemistry/metabolism ; *Lymphocyte Activation/drug effects ; Mice ; Phospholipids/*chemistry/*metabolism ; Phosphorylation/drug effects ; Receptor-CD3 Complex, Antigen, T-Cell/drug effects/immunology/*metabolism ; *Signal Transduction/drug effects ; Solvents/chemistry/metabolism ; Static Electricity ; T-Lymphocytes/drug effects/immunology/*metabolism ; Tyrosine/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2016-01-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Feng -- Lin, Qibing -- Zhu, Lihong -- Ren, Yulong -- Zhou, Kunneng -- Shabek, Nitzan -- Wu, Fuqing -- Mao, Haibin -- Dong, Wei -- Gan, Lu -- Ma, Weiwei -- Gao, He -- Chen, Jun -- Yang, Chao -- Wang, Dan -- Tan, Junjie -- Zhang, Xin -- Guo, Xiuping -- Wang, Jiulin -- Jiang, Ling -- Liu, Xi -- Chen, Weiqi -- Chu, Jinfang -- Yan, Cunyu -- Ueno, Kotomi -- Ito, Shinsaku -- Asami, Tadao -- Cheng, Zhijun -- Wang, Jie -- Lei, Cailin -- Zhai, Huqu -- Wu, Chuanyin -- Wang, Haiyang -- Zheng, Ning -- Wan, Jianmin -- England -- Nature. 2016 Apr 21;532(7599):402. doi: 10.1038/nature16537. Epub 2016 Jan 13.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26760207" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2011-09-24
    Description: We present an Aboriginal Australian genomic sequence obtained from a 100-year-old lock of hair donated by an Aboriginal man from southern Western Australia in the early 20th century. We detect no evidence of European admixture and estimate contamination levels to be below 0.5%. We show that Aboriginal Australians are descendants of an early human dispersal into eastern Asia, possibly 62,000 to 75,000 years ago. This dispersal is separate from the one that gave rise to modern Asians 25,000 to 38,000 years ago. We also find evidence of gene flow between populations of the two dispersal waves prior to the divergence of Native Americans from modern Asian ancestors. Our findings support the hypothesis that present-day Aboriginal Australians descend from the earliest humans to occupy Australia, likely representing one of the oldest continuous populations outside Africa.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3991479/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3991479/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rasmussen, Morten -- Guo, Xiaosen -- Wang, Yong -- Lohmueller, Kirk E -- Rasmussen, Simon -- Albrechtsen, Anders -- Skotte, Line -- Lindgreen, Stinus -- Metspalu, Mait -- Jombart, Thibaut -- Kivisild, Toomas -- Zhai, Weiwei -- Eriksson, Anders -- Manica, Andrea -- Orlando, Ludovic -- De La Vega, Francisco M -- Tridico, Silvana -- Metspalu, Ene -- Nielsen, Kasper -- Avila-Arcos, Maria C -- Moreno-Mayar, J Victor -- Muller, Craig -- Dortch, Joe -- Gilbert, M Thomas P -- Lund, Ole -- Wesolowska, Agata -- Karmin, Monika -- Weinert, Lucy A -- Wang, Bo -- Li, Jun -- Tai, Shuaishuai -- Xiao, Fei -- Hanihara, Tsunehiko -- van Driem, George -- Jha, Aashish R -- Ricaut, Francois-Xavier -- de Knijff, Peter -- Migliano, Andrea B -- Gallego Romero, Irene -- Kristiansen, Karsten -- Lambert, David M -- Brunak, Soren -- Forster, Peter -- Brinkmann, Bernd -- Nehlich, Olaf -- Bunce, Michael -- Richards, Michael -- Gupta, Ramneek -- Bustamante, Carlos D -- Krogh, Anders -- Foley, Robert A -- Lahr, Marta M -- Balloux, Francois -- Sicheritz-Ponten, Thomas -- Villems, Richard -- Nielsen, Rasmus -- Wang, Jun -- Willerslev, Eske -- BB/H005854/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- BB/H008802/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- R01 HG003229/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2011 Oct 7;334(6052):94-8. doi: 10.1126/science.1211177. Epub 2011 Sep 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for GeoGenetics, Natural History Museum of Denmark, Oster Voldgade 5-7, 1350 Copenhagen, Denmark.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21940856" target="_blank"〉PubMed〈/a〉
    Keywords: African Continental Ancestry Group ; Animals ; Asia ; Asian Continental Ancestry Group/genetics ; Computer Simulation ; DNA, Mitochondrial/genetics ; Emigration and Immigration ; Ethnic Groups/genetics ; European Continental Ancestry Group/genetics ; Far East ; Gene Flow ; Gene Frequency ; Genetics, Population/methods ; *Genome, Human ; Genome, Mitochondrial ; Haplotypes ; Hominidae/genetics ; Humans ; Linkage Disequilibrium ; Male ; Oceanic Ancestry Group/*genetics ; Phylogeny ; Polymorphism, Single Nucleotide ; Sequence Analysis, DNA ; Western Australia
    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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