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Soumya S, Vinod K, Harsita M, Sreelatha K, Durga Rao T, Ramesh Kumar K, Rout J, Gangopadhyay P, Bhatnagar A, Sattibabu B. Studies on the effect of In3+ ion on magnetic and magneto caloric properties of polycrystalline TbMnO3. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2023.123971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Magudapathy P, Srivastava S, Gangopadhyay P, Amirthapandian S, Saravanan K, Das A, Panigrahi B. Alloying of metal nanoparticles by ion-beam induced sputtering. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.11.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Baumeister S, Gangopadhyay P, Repnik U, Lingelbach K. Novel insights into red blood cell physiology using parasites as tools. Eur J Cell Biol 2015; 94:332-9. [DOI: 10.1016/j.ejcb.2015.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Thavayogarajah T, Gangopadhyay P, Rahlfs S, Becker K, Lingelbach K, Przyborski JM, Holder AA. Alternative Protein Secretion in the Malaria Parasite Plasmodium falciparum. PLoS One 2015; 10:e0125191. [PMID: 25909331 PMCID: PMC4409355 DOI: 10.1371/journal.pone.0125191] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 03/11/2015] [Indexed: 12/13/2022] Open
Abstract
Plasmodium falciparum invades human red blood cells, residing in a parasitophorous vacuole (PV), with a parasitophorous vacuole membrane (PVM) separating the PV from the host cell cytoplasm. Here we have investigated the role of N-myristoylation and two other N-terminal motifs, a cysteine potential S-palmitoylation site and a stretch of basic residues, as the driving force for protein targeting to the parasite plasma membrane (PPM) and subsequent translocation across this membrane. Plasmodium falciparum adenylate kinase 2 (Pf AK2) contains these three motifs, and was previously proposed to be targeted beyond the parasite to the PVM, despite the absence of a signal peptide for entry into the classical secretory pathway. Biochemical and microscopy analyses of PfAK2 variants tagged with green fluorescent protein (GFP) showed that these three motifs are involved in targeting the protein to the PPM and translocation across the PPM to the PV. It was shown that the N-terminal 37 amino acids of PfAK2 alone are sufficient to target and translocate GFP across the PPM. As a control we examined the N-myristoylated P. falciparum ADP-ribosylation factor 1 (PfARF1). PfARF1 was found to co-localise with a Golgi marker. To determine whether or not the putative palmitoylation and the cluster of lysine residues from the N-terminus of PfAK2 would modulate the subcellular localization of PfARF1, a chimeric fusion protein containing the N-terminus of PfARF1 and the two additional PfAK2 motifs was analysed. This chimeric protein was targeted to the PPM, but not translocated across the membrane into the PV, indicating that other features of the N-terminus of PfAK2 also play a role in the secretion process.
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Affiliation(s)
- Thuvaraka Thavayogarajah
- Division of Parasitology, Faculty of Biology, Philipps-University Marburg, Karl-von-Frisch Straße 8, 35043 Marburg, Germany
| | - Preetish Gangopadhyay
- Division of Parasitology, Faculty of Biology, Philipps-University Marburg, Karl-von-Frisch Straße 8, 35043 Marburg, Germany
| | - Stefan Rahlfs
- Biochemistry and Molecular Biology, Interdisciplinary Research Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Katja Becker
- Biochemistry and Molecular Biology, Interdisciplinary Research Center, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Klaus Lingelbach
- Division of Parasitology, Faculty of Biology, Philipps-University Marburg, Karl-von-Frisch Straße 8, 35043 Marburg, Germany
| | - Jude M. Przyborski
- Division of Parasitology, Faculty of Biology, Philipps-University Marburg, Karl-von-Frisch Straße 8, 35043 Marburg, Germany
- * E-mail: (AAH); (JMP)
| | - Anthony A. Holder
- The Francis Crick Institute Mill Hill Laboratory, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
- * E-mail: (AAH); (JMP)
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Repnik U, Gangopadhyay P, Bietz S, Przyborski JM, Griffiths G, Lingelbach K. The apicomplexan parasite Babesia divergens internalizes band 3, glycophorin A and spectrin during invasion of human red blood cells. Cell Microbiol 2015; 17:1052-68. [PMID: 25628009 DOI: 10.1111/cmi.12422] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 01/14/2015] [Accepted: 01/15/2015] [Indexed: 12/21/2022]
Abstract
Plasmodium falciparum invades human red blood cells (RBC), while Babesia divergens infects bovine and, occasionally, human RBC. The mammalian RBC is normally unable to endocytose or phagocytose and the events leading to invasion are incompletely understood. Initially, both parasites are surrounded by the RBC plasma membrane-derived parasitophorous vacuolar membrane (PVM) that is formed during invasion. In P. falciparum-infected RBC, the PVM persists at least until parasite replication is completed whereas it has been proposed that the B. divergens PVM is disintegrated soon upon invasion. Here, we have used a B. divergens strain adapted to human RBC to investigate the formation and fate of the PVM. Using ultrastructural analysis and whole-mount or on-section immunofluorescence and immunogold labelling, we demonstrate that the initial vacuolar membrane is formed from protein and lipid components of the RBC plasma membrane. Integral membrane proteins band 3 and glycophorin A and the cytoskeletal protein spectrin are associated with the PVM of the B. divergens, but are absent from the PVM of P. falciparum at the ring or the trophozoite stage. Our results provide evidence that the biophysical properties of the RBC cytoskeleton per se do not preclude the internalization of cytoskeletal proteins by invading parasites.
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Affiliation(s)
- Urska Repnik
- Department of Biosciences, University of Oslo, Blindernveien 31, Oslo, 0316, Norway
| | - Preetish Gangopadhyay
- Department of Parasitology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, 35043, Germany
| | - Sven Bietz
- Department of Parasitology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, 35043, Germany
| | - Jude M Przyborski
- Department of Parasitology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, 35043, Germany
| | - Gareth Griffiths
- Department of Biosciences, University of Oslo, Blindernveien 31, Oslo, 0316, Norway
| | - Klaus Lingelbach
- Department of Parasitology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, Marburg, 35043, Germany
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Srivastava S, Gangopadhyay P, Amirthapandian S, Sairam T, Basu J, Panigrahi B, Nair K. Effects of high-energy Si ion-irradiations on optical responses of Ag metal nanoparticles in a SiO2 matrix. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Affiliation(s)
- S Baruah
- Worcester Royal Hospital, Worcester, UK.
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Gangopadhyay P, Kesavamoorthy R, Bera S, Magudapathy P, Nair KGM, Panigrahi BK, Narasimhan SV. Optical absorption and photoluminescence spectroscopy of the growth of silver nanoparticles. Phys Rev Lett 2005; 94:047403. [PMID: 15783595 DOI: 10.1103/physrevlett.94.047403] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2004] [Indexed: 05/24/2023]
Abstract
Results obtained from the optical absorption and photoluminescence (PL) spectroscopy experiments have shown the formation of excitons in the silver-exchanged glass samples. These findings are reported here for the first time. Further, we investigate the dramatic changes in the photoemission properties of the silver-exchanged glass samples as a function of postannealing temperature. Observed changes are thought to be due to the structural rearrangements of silver and oxygen bonding during the heat treatments of the glass matrix. In fact, photoelectron spectroscopy does reveal these chemical transformations of silver-exchanged soda glass samples caused by the thermal effects of annealing in a high vacuum atmosphere. An important correlation between temperature-induced changes of the PL intensity and thermal growth of the silver nanoparticles has been established in this Letter through precise spectroscopic studies.
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Affiliation(s)
- P Gangopadhyay
- Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
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Rao DN, Naga Srinivas NKM, Gangopadhyay P, Radhakrishnan TP. Internal Cancellation of Electric Field Induced Second Harmonic Generation in Solvent Mixtures and Solutions: An Efficient Protocol for the Determination of Molecular Hyperpolarizability. J Phys Chem A 2004. [DOI: 10.1021/jp037635f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Narayana Rao
- School of Physics and School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - N. K. M. Naga Srinivas
- School of Physics and School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - P. Gangopadhyay
- School of Physics and School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - T. P. Radhakrishnan
- School of Physics and School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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Jayanty S, Gangopadhyay P, Radhakrishnan TP. Steering molecular dipoles from centrosymmetric to a noncentrosymmetric and SHG active assembly using remote functionality and complexationElectronic supplementary information (ESI) available: powder SHG variation with particle size for DMEDQ-TPA. See http://www.rsc.org/suppdata/jm/b2/b202804m/. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b202804m] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gangopadhyay P, Rao DN, Agranat I, Radhakrishnan TP. Strategic placement of stereogenic centers in molecular materials for second harmonic generation. Enantiomer 2002; 7:119-27. [PMID: 12108629 DOI: 10.1080/10242430212190] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Basic aspects of the nonlinear optical phenomenon of second harmonic generation (SHG) and the assembly of molecular materials for SHG are reviewed. Extensive use of chirality as a convenient tool to generate noncentrosymmetricity in molecular lattices, an essential requirement for the development of quadratic nonlinear optical materials, is noted. An overview of our investigations of chiral diaminodicyanoquinodimethanes is presented, which provides insight into a systematic approach to the effective deployment of chirality to achieve optimal molecular orientations for enhanced solid state SHG. Extension of these ideas to the realization of strong SHG in materials based on helical superstructures is outlined.
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Gangopadhyay P, Radhakrishnan TP. Helical Superstructures of a C(2)-Symmetric Molecule Exhibiting Strong Second Harmonic Generation in the Solid-State Financial support from the DST (Swarnajayanti Fellowship) and the use of the National Single Crystal Diffractometer Facility (funded by the DST at the School of Chemistry, University of Hyderabad) are gratefully acknowledged. P.G. thanks the University Grants Commission for a senior research fellowship. We thank du Pont Deutschland for a generous gift of 1,2-diaminocyclohexane. Angew Chem Int Ed Engl 2001; 40:2451-2455. [PMID: 11443661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Affiliation(s)
- P. Gangopadhyay
- School of Chemistry University of Hyderabad Hyderabad-500 046 (India)
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Gangopadhyay P, Radhakrishnan TP. Helical Superstructures of aC2-Symmetric Molecule Exhibiting Strong Second Harmonic Generation in the Solid-State. Angew Chem Int Ed Engl 2001; 40:2451-2455. [DOI: 10.1002/1521-3773(20010702)40:13<2451::aid-anie2451>3.0.co;2-m] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2001] [Revised: 04/05/2001] [Indexed: 11/08/2022]
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Sarkar M, Gangopadhyay P, Basak B, Chakrabarty K, Banerji J, Adhikary P, Chatterjee A. The reversible antifertility effect of Piper betle Linn. on Swiss albino male mice. Contraception 2000; 62:271-4. [PMID: 11172798 DOI: 10.1016/s0010-7824(00)00177-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
To study the antifertility effect of an extract (alcoholic) of the leaf-stalk of Piper betle Linn., one set of experiments with two different doses in Swiss male albino mice were evaluated. Initially, 500 mg of the leaf-stalk extractive for 30 days and then 1000 mg for next 30 days/animal/day/kg body weight were administered orally. The extract reduced fertility to 0% within 60 days. Suppression of cauda epididymal sperm count and motility (p <0.05) was observed. Biochemical parameters did not show any marked alterations in testosterone content in serum nor 17beta-hydroxysteroid dehydrogenase (17beta-HSD) activity in testes although fructose content in seminal vesicles was reduced as are the weights of reproductive organs. The cholesterol content in testes increased, although not appreciably. After cessation of drug (plant extract) treatment, the altered parameters recovered. Results suggest that the contraceptive effect of the extract of leaf-stalk of Piper betle Linn. is mainly on the maturation process of spermatozoa in epididymides without influencing hystemic hormonal profiles. Withdrawal of the extract restored all altered parameters including organ weights and fertility after 60 days.
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Affiliation(s)
- M Sarkar
- Centre of Advanced Studies on Natural Products, Department of Chemistry, University College of Science & Technology, Calcutta University, 92, Acharya Prafulla Chandra Road, 700 009, Calcutta, India
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Sengupta A, Adhikary P, Basak BK, Chakrabarti K, Gangopadhyay P, Banerji J, Chatterjee A. Pre-clinical toxicity evaluation of leaf-stalk extractive of Piper betle Linn. in rodents. Indian J Exp Biol 2000; 38:338-42. [PMID: 11218809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Studies on pre-clinical toxicity were undertaken to determine the haematological and biochemical changes after administration of alcoholic extract of leaf-stalk of P. betle in rats and mice. Acute and chronic toxicity experiments were performed on mice and rats according to WHO protocol. Different doses of plant extractive were administered for toxicity studies on short and long term basis. Haematological, biochemical profiles and enzymatic studies (transaminases and phosphatases) indicated that the drug (plant extractive) was devoid of toxicity.
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Affiliation(s)
- A Sengupta
- Department of Chemistry and Centre of Advanced Studies on Natural Products, University College of Science and Technology, Calcutta University, 92, A.P.C. Road, Calcutta 700 009, India
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Sharma S, Gangopadhyay P, Swathi A, Radhakrishnan TP. Computational study of molecules for quadratic nonlinear optical applications: orthogonal orientation of dipole vector and hyperpolarisability pseudo vector. Phys Chem Chem Phys 2000. [DOI: 10.1039/a907340j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Misra S, Chakraborty S, Gangopadhyay P, Basu N. Phenytoin sodium induced diabetes insipidus. J Assoc Physicians India 1999; 47:456. [PMID: 10778541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- S Misra
- Bangur Institute of Neurology, Calcutta
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Gangopadhyay P, Venugopal Rao S, Narayana Rao D, Radhakrishnan TP. N-Alkyl-p-nitroanilines: impact of alkyl chain length on crystal structures and optical SHG. ACTA ACUST UNITED AC 1999. [DOI: 10.1039/a901591d] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gangopadhyay S, Gangopadhyay P. A longitudinal study of biological changes with age among the Brahmins of Calcutta. Z Morphol Anthropol 1996; 81:157-66. [PMID: 9270333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In this paper, the individual biological sequence of change with age in a sample taken in metropolitan city, Calcutta, West Bengal, is discussed. The study comprises a few anthropometric measurements (stature, weight, biacromial breadth, nasal length, nasal breadth, upper facial height) taken on the same population at an interval of five years (first in the year 1982 and again in the year 1987). The study reveals that the amount of increment or decrement of some characters (the above mentioned traits) are different for different chronological age; and these differences can only be identified with the help of a longitudinal study which is free from the effect of secular change in the younger generations.
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Hall DT, Shemansky DE, Judge DL, Gangopadhyay P, Gruntman MA. Heliospheric hydrogen beyond 15 AU: Evidence for a termination shock. ACTA ACUST UNITED AC 1993. [DOI: 10.1029/93ja01175] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gangopadhyay P, Tang X, Lambropoulos P, Shakeshaft R. Theory of autoionization of Xe under two- and three-photon excitation. Phys Rev A Gen Phys 1986; 34:2998-3002. [PMID: 9897618 DOI: 10.1103/physreva.34.2998] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Mukherjee K, Gangopadhyay P. Extensor digitorum brevis transfer in chronic unstable ankles. J R Coll Surg Edinb 1983; 28:250-5. [PMID: 6631792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Pyne AK, Moitra DN, Gangopadhyay P. Studies on the composition of milk with the use of neem seed expeller cake (Az adirachta indica) on lactating buffaloes. Indian Vet J 1979; 56:223-7. [PMID: 573242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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