1. 
   platelet factor 4
   Platelet-released protein that promotes blood clotting by neutralising heparin.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   platelet factor 4
   <haematology> Platelet released protein that promotes blood clotting by neutralising heparin. ... (31 Dec 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?platelet+factor+4
   
   

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