1. 
   P ring
   <microbiology> One of the bushes at the base of the flagellum of gram-negative bacteria, anchoring it in the peptidoglycan layer of the cells wall. Lies below the L ring. ... (18 Nov 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?P+ring
   
   
2. 
   P ring
   The P ring is the part of the bacterial flagellum, which is known to be embedded in the peptidoglycan cell wall. ...
   Found op http://en.wikipedia.org/wiki/P_ring
   
   
3. 
   P-ring
   One of the bushes at the base of the flagellum of Gram negative bacteria, anchoring it in the peptidoglycan layer of the cells wall. Lies below the L-ring.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   

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