1. 
   atopen
   Type: Term Pronunciation: at′ō-pen Definitions: 1. An old term to denote the excitant causing any form of atopy.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=8334
   
   
2. 
   atopen
   The excitant causing any form of atopy. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?atopen
   
   
3. 
   atopen
   (at´ә-pen) the antigen responsible for atopy.
   Found op http://www.encyclo.co.uk/local/21001
   
   
4. 
   atopen
   1) The excitant causing any form of atopy
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/atopen/1
   
   

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