<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982022000300685</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2991</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Analysis of the extranucleolar ribonucleoprotein particles of Cycas revoluta Thunb. (Cycadaceae) and Ceratozamia mexicana Brongn. (Zamiaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de las partículas ribonucleoproteicas extranucleolares de Cycas revoluta Thunb. (Cycadaceae) y Ceratozamia mexicana Brongn. (Zamiaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agredano-Moreno]]></surname>
<given-names><![CDATA[Lourdes-Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Segura-Valdez]]></surname>
<given-names><![CDATA[María de Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Ramírez]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-García]]></surname>
<given-names><![CDATA[Luis-Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Electron Microscopy Laboratory (Tlahuizcalpan)]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Celular]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Department of Comparative Biology]]></institution>
<addr-line><![CDATA[CDMX ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>100</volume>
<numero>3</numero>
<fpage>685</fpage>
<lpage>691</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982022000300685&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982022000300685&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982022000300685&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Nuclear ribonucleoprotein particles play a key role in RNA processing and in the gene expression pathway. Interchromatin granules (GICs) involved in the metabolism of pre-messenger RNA (pre-mRNA) were described in Allium cepa and Chiranthodendron pentadactylon. Other particles as Lacandonia granules (LGs) were found in Lacandonia schismatica as well as Ginkgo biloba and Welwitschia mirabilis. LGs are structures equivalent to perichromatin granules (PCGs) described in mammals and to Balbiani ring granules (BRGs) described in the midge Chironomus tentans. PCGs and BRGs are involved in the metabolism of messenger RNA (mRNA). Here, we analyze the extranucleolar particles from Cycas revoluta and Ceratozamia mexicana and compare them to GICs and LGs using conventional electron microscopy and atomic force microscopy.  Species study: Cycas revoluta (Cycadaceae) and Ceratozamia mexicana (Zamiaceae)  Hypothesis: The extranucleolar ribonucleoprotein particles in the nuclei of C. revoluta and C. mexicana are equivalent to GICs or GLs.  Methods: Fragments of young leaves of C. revoluta and C. mexicana were processed for standard transmission electron microscopy. Thin sections were stained with the EDTA technique preferential for ribonucleoproteins and osmium amine specific for DNA. From the semithin sections the samples were studied with the AFM and images of them were obtained.  Results: Ribonucleoprotein particles 32 nm in diameter are present in the interchromatin and perichromatin space in C. revoluta and C. mexicana.  Conclusion: Ribonucleoprotein particles present in the cell nuclei of C. mexicana and C. revoluta are ultrastructurally equivalent to LGs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes:  Las partículas ribonucleoproteicas nucleares desempeñan un papel clave en el procesamiento del RNA en la vía de la expresión génica. En Allium cepa y Chiranthodendron pentadactylon se describieron los gránulos intercromatinianos (GICs) involucrados en el metabolismo del RNA pre-mensajero (pre-mRNA). En Lacandonia schismatica, Ginkgo biloba y Welwitschia mirabilis se encontraron partículas conocidas como gránulos de Lacandonia (LGs), equivalentes a los gránulos pericromatinianos (PCGs) de mamíferos y del mosquito Chironomus tentans (BRGs). Los PCGs y los BRGs están involucrados en el metabolismo del RNA mensajero (mRNA). En este trabajo analizamos las partículas extranucleolares de Cycas revoluta y Ceratozamia mexicana y las comparamos con los GICs y LGs usando microscopía electrónica y de fuerza atómica.  Especies de estudio: Cycas revoluta (Cycadaceae) y Ceratozamia mexicana (Zamiaceae)  Hipótesis:  Las partículas ribonucleoproteicas extranucleolares presentes en los núcleos de C. revoluta y C. mexicana son equivalentes a los GICs o a los GLs.  Métodos:  Se procesaron fragmentos de hojas jóvenes de C. revoluta y C. mexicana para microscopía electrónica. Algunos cortes se contrastaron con la técnica de EDTA para ribonucleoproteínas y otros con la técnica de amina osmio para DNA. Algunos cortes semifinos se observaron con el microscopio de fuerza atómica y otros con el microscopio óptico.  Resultados:  En C. revoluta y C. mexicana se presentan partículas ribonucleoproteicas de 32 nm de diámetro en el espacio intercromatiniano y periocromatiniano.  Conclusión:  Las ribonucleoproteínas presentes en el núcleo celular de C. mexicana y C. revoluta son equivalentes ultraestructuralmente a los gránulos de Lacandonia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Atomic force microscopy]]></kwd>
<kwd lng="en"><![CDATA[cell nucleus]]></kwd>
<kwd lng="en"><![CDATA[Cycads]]></kwd>
<kwd lng="en"><![CDATA[ribonucleoprotein particles]]></kwd>
<kwd lng="en"><![CDATA[Lacandonia granules]]></kwd>
<kwd lng="es"><![CDATA[microscopía de fuerza atómica]]></kwd>
<kwd lng="es"><![CDATA[núcleo celular]]></kwd>
<kwd lng="es"><![CDATA[Cicadas]]></kwd>
<kwd lng="es"><![CDATA[partículas ribonucleproteicas]]></kwd>
<kwd lng="es"><![CDATA[gránulos de Lacandonia]]></kwd>
</kwd-group>
</article-meta>
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