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</topic><topic id="https://vocabulario.abcd.usp.br/pt-br/?tema=71423"><instanceOf><topicRef xlink:href="#term"/></instanceOf><baseName><baseNameString>ÓXIDO NÍTRICO</baseNameString></baseName>  <occurrence>    <instanceOf>      <topicRef xlink:href="#scope-note"/>    </instanceOf><baseName><baseNameString><![CDATA[ É um radical livre, gasoso, inorgânico, incolor que possui sete elétrons do nitrogênio e oito do oxigênio, tendo um elétron desemparelhado. Até meados da década de 1980, o NO era considerado apenas membro de uma família de poluentes ambientais indesejáveis e carcinógenos potenciais. Atualmente constitui um dos mais importantes mediadores de processos intra e extracelulares.<p>Fonte: DUSSE, Luci Maria Sant'Ana, VIEIRA, Lauro Mello, CARVALHO, Maria das Graças. In: Jornal Brasileiro de Patologia e Medicina Laboratorial. Rio de Janeiro, v.39, n.4, p.343-50, 2003.<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=71423"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=82322"/>    </member>  </association></topicMap>