A global analysis of Y-chromosomal haplotype diversity for 23 STR loci

Autores
Corach, Daniel; Caputo, Mariela; Marino, Miguel Eduardo; Purps, Josephine; Siegert, Sabine; Willuweit, Sascha; Nagy, Marion; Alves, Cíntia; Salazar, Renato; Angustia, Sheila M. T.; Santos, Lorna H.; Anslinger, Katja; Bayer, Birgit; Ayub, Qasim; Wei, Wei; Xue, Yali; Tyler Smith, Chris; Baeta Bafalluy, Miriam; Martínez Jarreta, Begoña; Egyed, Balazs; Balitzki, Beate; Tschumi, Sibylle; Ballard, David; Syndercombe Court, Denise; Barrantes, Xinia; Bäßler, Gerhard; Berger, Burkhard; Niederstätter, Haral; Parson, Walther; Davis, Carey; Furfuro, Sandra; Locarno, Laura
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In a worldwide collaborative effort, 19,630 Y-chromosomes were sampled from 129 different populations in 51 countries. These chromosomes were typed for 23 short-tandem repeat (STR) loci (DYS19, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS385ab, DYS437, DYS438, DYS439, DYS448, DYS456, DYS458, DYS635, GATAH4, DYS481, DYS533, DYS549, DYS570, DYS576, and DYS643) and using the PowerPlex Y23 System (PPY23, Promega Corporation, Madison, WI). Locus-specific allelic spectra of these markers were determined and a consistently high level of allelic diversity was observed. A considerable number of null, duplicate and off-ladder alleles were revealed. Standard single-locus and haplotype-based parameters were calculated and compared between subsets of Y-STR markers established for forensic casework. The PPY23 marker set provides substantially stronger discriminatory power than other available kits but at the same time reveals the same general patterns of population structure as other marker sets. A strong correlation was observed between the number of Y-STRs included in a marker set and some of the forensic parameters under study. Interestingly a weak but consistent trend toward smaller genetic distances resulting from larger numbers of markers became apparent.
Fil: Corach, Daniel. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Caputo, Mariela. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Marino, Miguel Eduardo. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Analisis de ADN; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Purps, Josephine. Charité-Universitätsmedizin; Alemania
Fil: Siegert, Sabine. University of Cologne; Alemania
Fil: Willuweit, Sascha. Charité-Universitätsmedizin; Alemania
Fil: Nagy, Marion. Charité-Universitätsmedizin; Alemania
Fil: Alves, Cíntia. Universidad de Porto; Portugal
Fil: Salazar, Renato. Universidad de Porto; Portugal
Fil: Angustia, Sheila M. T.. Philippine National Police Crime Laboratory; Filipinas
Fil: Santos, Lorna H.. Philippine National Police Crime Laboratory; Filipinas
Fil: Anslinger, Katja. Universitat Genzentrum Der Ludwing-maximilians; Alemania
Fil: Bayer, Birgit. Universitat Genzentrum Der Ludwing-maximilians; Alemania
Fil: Ayub, Qasim. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Wei, Wei. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Xue, Yali. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Tyler Smith, Chris. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Baeta Bafalluy, Miriam. Universidad de Zaragoza; España
Fil: Martínez Jarreta, Begoña. Universidad de Zaragoza; España
Fil: Egyed, Balazs. Eotvos University, Budapest; Argentina
Fil: Balitzki, Beate. Universidad de Basilea; Suiza
Fil: Tschumi, Sibylle. Universidad de Basilea; Suiza
Fil: Ballard, David. King; Reino Unido
Fil: Syndercombe Court, Denise. King; Reino Unido
Fil: Barrantes, Xinia. Poder Judicial, Forensic Sciences Department; Costa Rica
Fil: Bäßler, Gerhard. Landeskriminalamt Baden-Württemberg; Alemania
Fil: Berger, Burkhard. Universidad de Innsbruck; Austria
Fil: Niederstätter, Haral. Universidad de Innsbruck; Austria
Fil: Parson, Walther. Universidad de Innsbruck; Austria. University Park; Estados Unidos
Fil: Davis, Carey. Department of Molecular and Medical Genetics; Estados Unidos. Institute of Applied Genetics; Estados Unidos
Fil: Furfuro, Sandra. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; Argentina
Fil: Locarno, Laura. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; Argentina
Materia
Gene diversity
Discriminatory power
AMOVA
Population structure
Database
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/16096

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oai_identifier_str oai:ri.conicet.gov.ar:11336/16096
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A global analysis of Y-chromosomal haplotype diversity for 23 STR lociCorach, DanielCaputo, MarielaMarino, Miguel EduardoPurps, JosephineSiegert, SabineWilluweit, SaschaNagy, MarionAlves, CíntiaSalazar, RenatoAngustia, Sheila M. T.Santos, Lorna H.Anslinger, KatjaBayer, BirgitAyub, QasimWei, WeiXue, YaliTyler Smith, ChrisBaeta Bafalluy, MiriamMartínez Jarreta, BegoñaEgyed, BalazsBalitzki, BeateTschumi, SibylleBallard, DavidSyndercombe Court, DeniseBarrantes, XiniaBäßler, GerhardBerger, BurkhardNiederstätter, HaralParson, WaltherDavis, CareyFurfuro, SandraLocarno, LauraGene diversityDiscriminatory powerAMOVAPopulation structureDatabasehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1In a worldwide collaborative effort, 19,630 Y-chromosomes were sampled from 129 different populations in 51 countries. These chromosomes were typed for 23 short-tandem repeat (STR) loci (DYS19, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS385ab, DYS437, DYS438, DYS439, DYS448, DYS456, DYS458, DYS635, GATAH4, DYS481, DYS533, DYS549, DYS570, DYS576, and DYS643) and using the PowerPlex Y23 System (PPY23, Promega Corporation, Madison, WI). Locus-specific allelic spectra of these markers were determined and a consistently high level of allelic diversity was observed. A considerable number of null, duplicate and off-ladder alleles were revealed. Standard single-locus and haplotype-based parameters were calculated and compared between subsets of Y-STR markers established for forensic casework. The PPY23 marker set provides substantially stronger discriminatory power than other available kits but at the same time reveals the same general patterns of population structure as other marker sets. A strong correlation was observed between the number of Y-STRs included in a marker set and some of the forensic parameters under study. Interestingly a weak but consistent trend toward smaller genetic distances resulting from larger numbers of markers became apparent.Fil: Corach, Daniel. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Caputo, Mariela. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Marino, Miguel Eduardo. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Analisis de ADN; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Purps, Josephine. Charité-Universitätsmedizin; AlemaniaFil: Siegert, Sabine. University of Cologne; AlemaniaFil: Willuweit, Sascha. Charité-Universitätsmedizin; AlemaniaFil: Nagy, Marion. Charité-Universitätsmedizin; AlemaniaFil: Alves, Cíntia. Universidad de Porto; PortugalFil: Salazar, Renato. Universidad de Porto; PortugalFil: Angustia, Sheila M. T.. Philippine National Police Crime Laboratory; FilipinasFil: Santos, Lorna H.. Philippine National Police Crime Laboratory; FilipinasFil: Anslinger, Katja. Universitat Genzentrum Der Ludwing-maximilians; AlemaniaFil: Bayer, Birgit. Universitat Genzentrum Der Ludwing-maximilians; AlemaniaFil: Ayub, Qasim. The Wellcome Trust Sanger Institute; Reino UnidoFil: Wei, Wei. The Wellcome Trust Sanger Institute; Reino UnidoFil: Xue, Yali. The Wellcome Trust Sanger Institute; Reino UnidoFil: Tyler Smith, Chris. The Wellcome Trust Sanger Institute; Reino UnidoFil: Baeta Bafalluy, Miriam. Universidad de Zaragoza; EspañaFil: Martínez Jarreta, Begoña. Universidad de Zaragoza; EspañaFil: Egyed, Balazs. Eotvos University, Budapest; ArgentinaFil: Balitzki, Beate. Universidad de Basilea; SuizaFil: Tschumi, Sibylle. Universidad de Basilea; SuizaFil: Ballard, David. King; Reino UnidoFil: Syndercombe Court, Denise. King; Reino UnidoFil: Barrantes, Xinia. Poder Judicial, Forensic Sciences Department; Costa RicaFil: Bäßler, Gerhard. Landeskriminalamt Baden-Württemberg; AlemaniaFil: Berger, Burkhard. Universidad de Innsbruck; AustriaFil: Niederstätter, Haral. Universidad de Innsbruck; AustriaFil: Parson, Walther. Universidad de Innsbruck; Austria. University Park; Estados UnidosFil: Davis, Carey. Department of Molecular and Medical Genetics; Estados Unidos. Institute of Applied Genetics; Estados UnidosFil: Furfuro, Sandra. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; ArgentinaFil: Locarno, Laura. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; ArgentinaElsevier Ireland2014-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/16096Corach, Daniel; Caputo, Mariela; Marino, Miguel Eduardo; Purps, Josephine; Siegert, Sabine; et al.; A global analysis of Y-chromosomal haplotype diversity for 23 STR loci; Elsevier Ireland; Forensic Science International: Genetics; 12; 9-2014; 12-231872-4973enginfo:eu-repo/semantics/altIdentifier/url/http://www.ncbi.nlm.nih.gov/pubmed/24854874info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1872497314000842info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fsigen.2014.04.008info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:42:06Zoai:ri.conicet.gov.ar:11336/16096instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:42:06.346CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
title A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
spellingShingle A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
Corach, Daniel
Gene diversity
Discriminatory power
AMOVA
Population structure
Database
title_short A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
title_full A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
title_fullStr A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
title_full_unstemmed A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
title_sort A global analysis of Y-chromosomal haplotype diversity for 23 STR loci
dc.creator.none.fl_str_mv Corach, Daniel
Caputo, Mariela
Marino, Miguel Eduardo
Purps, Josephine
Siegert, Sabine
Willuweit, Sascha
Nagy, Marion
Alves, Cíntia
Salazar, Renato
Angustia, Sheila M. T.
Santos, Lorna H.
Anslinger, Katja
Bayer, Birgit
Ayub, Qasim
Wei, Wei
Xue, Yali
Tyler Smith, Chris
Baeta Bafalluy, Miriam
Martínez Jarreta, Begoña
Egyed, Balazs
Balitzki, Beate
Tschumi, Sibylle
Ballard, David
Syndercombe Court, Denise
Barrantes, Xinia
Bäßler, Gerhard
Berger, Burkhard
Niederstätter, Haral
Parson, Walther
Davis, Carey
Furfuro, Sandra
Locarno, Laura
author Corach, Daniel
author_facet Corach, Daniel
Caputo, Mariela
Marino, Miguel Eduardo
Purps, Josephine
Siegert, Sabine
Willuweit, Sascha
Nagy, Marion
Alves, Cíntia
Salazar, Renato
Angustia, Sheila M. T.
Santos, Lorna H.
Anslinger, Katja
Bayer, Birgit
Ayub, Qasim
Wei, Wei
Xue, Yali
Tyler Smith, Chris
Baeta Bafalluy, Miriam
Martínez Jarreta, Begoña
Egyed, Balazs
Balitzki, Beate
Tschumi, Sibylle
Ballard, David
Syndercombe Court, Denise
Barrantes, Xinia
Bäßler, Gerhard
Berger, Burkhard
Niederstätter, Haral
Parson, Walther
Davis, Carey
Furfuro, Sandra
Locarno, Laura
author_role author
author2 Caputo, Mariela
Marino, Miguel Eduardo
Purps, Josephine
Siegert, Sabine
Willuweit, Sascha
Nagy, Marion
Alves, Cíntia
Salazar, Renato
Angustia, Sheila M. T.
Santos, Lorna H.
Anslinger, Katja
Bayer, Birgit
Ayub, Qasim
Wei, Wei
Xue, Yali
Tyler Smith, Chris
Baeta Bafalluy, Miriam
Martínez Jarreta, Begoña
Egyed, Balazs
Balitzki, Beate
Tschumi, Sibylle
Ballard, David
Syndercombe Court, Denise
Barrantes, Xinia
Bäßler, Gerhard
Berger, Burkhard
Niederstätter, Haral
Parson, Walther
Davis, Carey
Furfuro, Sandra
Locarno, Laura
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Gene diversity
Discriminatory power
AMOVA
Population structure
Database
topic Gene diversity
Discriminatory power
AMOVA
Population structure
Database
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In a worldwide collaborative effort, 19,630 Y-chromosomes were sampled from 129 different populations in 51 countries. These chromosomes were typed for 23 short-tandem repeat (STR) loci (DYS19, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS385ab, DYS437, DYS438, DYS439, DYS448, DYS456, DYS458, DYS635, GATAH4, DYS481, DYS533, DYS549, DYS570, DYS576, and DYS643) and using the PowerPlex Y23 System (PPY23, Promega Corporation, Madison, WI). Locus-specific allelic spectra of these markers were determined and a consistently high level of allelic diversity was observed. A considerable number of null, duplicate and off-ladder alleles were revealed. Standard single-locus and haplotype-based parameters were calculated and compared between subsets of Y-STR markers established for forensic casework. The PPY23 marker set provides substantially stronger discriminatory power than other available kits but at the same time reveals the same general patterns of population structure as other marker sets. A strong correlation was observed between the number of Y-STRs included in a marker set and some of the forensic parameters under study. Interestingly a weak but consistent trend toward smaller genetic distances resulting from larger numbers of markers became apparent.
Fil: Corach, Daniel. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Caputo, Mariela. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Servicio de Huellas Digitales Genéticas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Marino, Miguel Eduardo. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Analisis de ADN; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Purps, Josephine. Charité-Universitätsmedizin; Alemania
Fil: Siegert, Sabine. University of Cologne; Alemania
Fil: Willuweit, Sascha. Charité-Universitätsmedizin; Alemania
Fil: Nagy, Marion. Charité-Universitätsmedizin; Alemania
Fil: Alves, Cíntia. Universidad de Porto; Portugal
Fil: Salazar, Renato. Universidad de Porto; Portugal
Fil: Angustia, Sheila M. T.. Philippine National Police Crime Laboratory; Filipinas
Fil: Santos, Lorna H.. Philippine National Police Crime Laboratory; Filipinas
Fil: Anslinger, Katja. Universitat Genzentrum Der Ludwing-maximilians; Alemania
Fil: Bayer, Birgit. Universitat Genzentrum Der Ludwing-maximilians; Alemania
Fil: Ayub, Qasim. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Wei, Wei. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Xue, Yali. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Tyler Smith, Chris. The Wellcome Trust Sanger Institute; Reino Unido
Fil: Baeta Bafalluy, Miriam. Universidad de Zaragoza; España
Fil: Martínez Jarreta, Begoña. Universidad de Zaragoza; España
Fil: Egyed, Balazs. Eotvos University, Budapest; Argentina
Fil: Balitzki, Beate. Universidad de Basilea; Suiza
Fil: Tschumi, Sibylle. Universidad de Basilea; Suiza
Fil: Ballard, David. King; Reino Unido
Fil: Syndercombe Court, Denise. King; Reino Unido
Fil: Barrantes, Xinia. Poder Judicial, Forensic Sciences Department; Costa Rica
Fil: Bäßler, Gerhard. Landeskriminalamt Baden-Württemberg; Alemania
Fil: Berger, Burkhard. Universidad de Innsbruck; Austria
Fil: Niederstätter, Haral. Universidad de Innsbruck; Austria
Fil: Parson, Walther. Universidad de Innsbruck; Austria. University Park; Estados Unidos
Fil: Davis, Carey. Department of Molecular and Medical Genetics; Estados Unidos. Institute of Applied Genetics; Estados Unidos
Fil: Furfuro, Sandra. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; Argentina
Fil: Locarno, Laura. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Laboratorio de Análisis de ADN; Argentina
description In a worldwide collaborative effort, 19,630 Y-chromosomes were sampled from 129 different populations in 51 countries. These chromosomes were typed for 23 short-tandem repeat (STR) loci (DYS19, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS385ab, DYS437, DYS438, DYS439, DYS448, DYS456, DYS458, DYS635, GATAH4, DYS481, DYS533, DYS549, DYS570, DYS576, and DYS643) and using the PowerPlex Y23 System (PPY23, Promega Corporation, Madison, WI). Locus-specific allelic spectra of these markers were determined and a consistently high level of allelic diversity was observed. A considerable number of null, duplicate and off-ladder alleles were revealed. Standard single-locus and haplotype-based parameters were calculated and compared between subsets of Y-STR markers established for forensic casework. The PPY23 marker set provides substantially stronger discriminatory power than other available kits but at the same time reveals the same general patterns of population structure as other marker sets. A strong correlation was observed between the number of Y-STRs included in a marker set and some of the forensic parameters under study. Interestingly a weak but consistent trend toward smaller genetic distances resulting from larger numbers of markers became apparent.
publishDate 2014
dc.date.none.fl_str_mv 2014-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/16096
Corach, Daniel; Caputo, Mariela; Marino, Miguel Eduardo; Purps, Josephine; Siegert, Sabine; et al.; A global analysis of Y-chromosomal haplotype diversity for 23 STR loci; Elsevier Ireland; Forensic Science International: Genetics; 12; 9-2014; 12-23
1872-4973
url http://hdl.handle.net/11336/16096
identifier_str_mv Corach, Daniel; Caputo, Mariela; Marino, Miguel Eduardo; Purps, Josephine; Siegert, Sabine; et al.; A global analysis of Y-chromosomal haplotype diversity for 23 STR loci; Elsevier Ireland; Forensic Science International: Genetics; 12; 9-2014; 12-23
1872-4973
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.ncbi.nlm.nih.gov/pubmed/24854874
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1872497314000842
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.fsigen.2014.04.008
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Ireland
publisher.none.fl_str_mv Elsevier Ireland
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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