span class="relContDate">02 Jun 2009</span>
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<p>
The work could now help scientists predict the "biological age" of 
  people based on the state of their immune system. 
</p>
<p>
Professor Katsuiku Hirokawa, who led the research at Tokyo Medical &amp; 
  Dental University, said: "Because people age at different rates, a 
  person's immunological parameters could be used to provide an indication of 
  their true biological age." 
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<p>
The s