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</topic><topic id="https://vocabulario.abcd.usp.br/pt-br/?tema=83069"><instanceOf><topicRef xlink:href="#term"/></instanceOf><baseName><baseNameString>RECEPTORES ADRENÉRGICOS</baseNameString></baseName>  <occurrence>    <instanceOf>      <topicRef xlink:href="#scope-note"/>    </instanceOf><baseName><baseNameString><![CDATA[ Proteínas de superfície celular que ligam epinefrina e/ou norepinefrina com alta afinidade e desencadeiam mudanças intracelulares. As duas principais classes de receptores adrenérgicos, a alfa e a beta, foram originalmente discriminadas com base nas suas ações celulares, mas agora são distinguidas através da sua relativa afinidade por ligantes sintéticos característicos. Os receptores adrenérgicos também podem ser classificados de acordo com os subtipos de proteína G com as quais eles se ligam; esse esquema não respeita a distinção alfa/beta.<p>Fonte: DeCS. Disponível em: https://decs.bvsalud.org<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=83069"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=83066"/>    </member>  </association></topicMap>