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</topic><topic id="https://vocabulario.abcd.usp.br/pt-br/?tema=64431"><instanceOf><topicRef xlink:href="#term"/></instanceOf><baseName><baseNameString>MICRORNAS</baseNameString></baseName>  <occurrence>    <instanceOf>      <topicRef xlink:href="#scope-note"/>    </instanceOf><baseName><baseNameString><![CDATA[ RNAs pequenos, de cadeia dupla, de codificação não proteica, com 21-25 nucleotídeos de extensão, gerados a partir transcritos do gene de microRNA de cadeia única pela mesma Ribonuclease III, Dicer, que produz RNAs interferentes pequenos (RNA Interferente Pequeno). Eles tornam-se parte do Complexo de Inativação Induzido por RNA e reprimem a tradução (Tradução Genética) de RNA alvo por ligação a região 3'UTR homóloga como um par imperfeito. Os RNAs temporários pequenos (stRNAs), let-7 e lin-4, de C. elegans, são os primeiros 2 miRNAs encontrados, e são de uma classe de miRNAs envolvidos no controle do tempo de desenvolvimento. <p>Fonte: DeCS. Disponível em: http://decs.bvs.br.<p> ]]></baseNameString></baseName>  </occurrence></topic>  <association>    <instanceOf>      <topicRef xlink:href="#broader-narrower"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#narrower"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=64431"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=86262"/>    </member>  </association></topicMap>