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• 
  Online resource available at: JSTOR Access Initiative
• Available from 07/23/1990 volume: 241.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: JSTOR Life Sciences Collection
• Available from 07/23/1990 volume: 241.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: PubMed Central
• Available from 1997 volume: 264.
  Most recent 1 year(s) not available.
  
• Selected full text available at: PubMed Central Open Access
• 
  Online resource available at: Royal Society Package S Show license Hide license
• Available from 07/01/1990 volume: 241.
  
• Open Access version of full text found via: Unpaywall

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• Biology letters. (Succeeds)
• 
  Online resource available at: PubMed Central
• Available from 2005 volume: 1 issue: 1.
  Most recent 1 year(s) not available.
  
• Biology letters. (Succeeds)
• Selected full text available at: PubMed Central Open Access
• Biology letters. (Succeeds)
• 
  Online resource available at: Royal Society Package S Show license Hide license
• Available from 03/01/2005 volume: 1 issue: 1.
  

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