1. 
   proactivator
   <biochemistry> A substance that, when chemically split, yields a fragment (activator) capable of rendering another substance enzymatically active. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?proactivator
   
   
2. 
   proactivator
   (pro-ak´tĭ-va″tәr) a precursor of an activator; a factor that reacts with an enzyme to form an activator.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   proactivator
   Type: Term Pronunciation: prō′ak′ti-vā-tŏr Definitions: 1. A substance that, when chemically split, yields a fragment (activator) capable of rendering another substance enzymatically active.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=72136
   
   

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