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  Online resource available at: JSTOR Access Initiative
• Available from 02/01/2002 volume: 42 issue: 1.
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  Online resource available at: JSTOR Biological Sciences Collection
• Available from 02/01/2002 volume: 42 issue: 1.
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• 
  Online resource available at: JSTOR Life Sciences Collection
• Available from 02/01/2002 volume: 42 issue: 1.
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• 
  Online resource available at: Oxford University Press Journals Current Show license Hide license
• Available from 02/01/2002 volume: 42 issue: 1.
  
• Selected full text available at: PubMed Central
• Available from 2007 volume: 47 issue: 4.
  Most recent 1 year(s) not available.
  
• Open Access version of full text found via: Unpaywall

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