1. 
   P1
   <abbreviation> Parental generation; symbol for inorganic orthophosphate (should not be used when covalently linked to another moiety). ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?P1
   
   
2. 
   P1
   parental generation.
   Found op http://www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszS
   
   
3. 
   P1
   (from the article `Pluto`) Pluto`s other two moons, called Hydra and Nix (provisionally designated S/2005 P1 and S/2005 P2, respectively, on their discovery), are much smaller ...
   Found op http://www.britannica.com/eb/a-z/p/1
   
   
4. 
   P1
   Type: Abbreviation Definitions: 1. Abbreviation for parental generation.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=64306
   
   

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