<?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>1729-519X</journal-id>
<journal-title><![CDATA[Revista Habanera de Ciencias Médicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev haban cienc méd]]></abbrev-journal-title>
<issn>1729-519X</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Ciencias Médicas de la Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1729-519X2021000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Protocolo para la citología vaginal directa de ratas de laboratorio]]></article-title>
<article-title xml:lang="en"><![CDATA[Protocol for direct vaginal cytology of laboratory rats]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Romero]]></surname>
<given-names><![CDATA[Tammy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez Román]]></surname>
<given-names><![CDATA[Gipsis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Clapés Hernández]]></surname>
<given-names><![CDATA[Sonia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciencias Médicas de La Habana Instituto de Ciencias Básicas y Preclínicas &#8220;Victoria de Girón&#8221; Departamento de Bioquímica]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>20</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1729-519X2021000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1729-519X2021000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1729-519X2021000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: La citología vaginal directa es un método muy utilizado para la evaluación del ciclo estral de las ratas de laboratorio, pero la información acerca de los procedimientos e interpretación de los resultados aparece disgregada en la literatura, lo cual dificulta su empleo en los estudios de reproducción.  Objetivo:  Proponer un protocolo para la realización de la citología vaginal directa de ratas de laboratorio y la interpretación de los resultados.  Material y métodos:  Se combinó la información de la literatura y la experiencia de 10 años de estudios de reproducción, en los que se han empleado un total de 250 ratas Wistar hembras, siguiendo preceptos éticos establecidos. Se describen los procedimientos para la obtención de las muestras, mediante lavado vaginal, así como para su observación y análisis en estado húmedo, con microscopio óptico y cámara digital acoplada.  Resultados: Se describen los tipos celulares principales presentes en el lavado vaginal y las características que permiten identificar cada fase o estado de transición del ciclo estral. Se discuten aspectos a considerar en la interpretación de los resultados, que incluye la relación con los cambios hormonales, los cuidados en la obtención de la muestra y la influencia de factores ambientales. Se muestran imágenes y figuras representativas para ilustrar el texto.  Conclusiones: El trabajo constituye un protocolo para el estudio del ciclo estral de ratas de laboratorio, mediante la citología vaginal directa. Provee métodos no invasivos, sencillos y económicos, así como conocimientos esenciales para la interpretación de los resultados, que integran una guía de gran utilidad para los estudios experimentales de reproducción.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: Direct vaginal cytology is a widely used method for the evaluation of the estrous cycle of laboratory rats, but the information about the procedures and interpretation of results is dispersed through literature, making its use difficult in investigations on reproduction.  Objective:  To propose a protocol for performing direct vaginal cytology of laboratory rats as well as for the interpretation of the results.  Material and methods:  The information obtained from literature and the experience of 10 years of investigation on reproduction in 250 female Wistar rats were combined following the established ethical principles. The procedures for obtaining samples by vaginal washing and by observation and analysis in humid state with light microscope equipped with digital camera were described.  Results:  The main types of cells present in the vaginal washing and the characteristics that allow us to identify each phase or transitional phases of the estrus cycle are described. Aspects to take into consideration in the interpretation of the results, which include the association between hormonal changes, the cares in the obtaining of the sample and the influence of environmental factors, are discussed. Representative images and figures are included to illustrate the text.  Conclusions:  The work consists of a study protocol of the estrus cycle of laboratory rats by direct vaginal cytology. It provides noninvasive, simple and cost-reducing procedures as well as essential knowledge for the interpretation of results which integrate a very useful guideline for experimental investigations on reproduction.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ciclo estral]]></kwd>
<kwd lng="es"><![CDATA[estro]]></kwd>
<kwd lng="es"><![CDATA[metestro]]></kwd>
<kwd lng="es"><![CDATA[diestro]]></kwd>
<kwd lng="es"><![CDATA[proestro]]></kwd>
<kwd lng="es"><![CDATA[citología vaginal directa]]></kwd>
<kwd lng="es"><![CDATA[ratas Wistar]]></kwd>
<kwd lng="en"><![CDATA[Estrous cycle]]></kwd>
<kwd lng="en"><![CDATA[estrus]]></kwd>
<kwd lng="en"><![CDATA[metestrus]]></kwd>
<kwd lng="en"><![CDATA[diestrus]]></kwd>
<kwd lng="en"><![CDATA[proestrus]]></kwd>
<kwd lng="en"><![CDATA[direct vaginal cytology]]></kwd>
<kwd lng="en"><![CDATA[Wistar rats]]></kwd>
</kwd-group>
</article-meta>
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