than-men.html">tend 
  to have fewer faults than in men</a>. 
</p></div><div class="fourthPar">
<p>
Scientists in Japan have now uncovered another reason after finding that the 
  levels of white blood cells and other parts of the immune system called 
  cytokines decline faster in men. 
</p></div><div class="fifthPar">
<p>
They believe this might be because female sex hormones such as oestrogen can 
  boost the immune system&rsquo;s response to infections. 
</p></div><div id="tmg-related-links" class="rela