1. 
   JTB
   [gene] Protein JTB also known as the jumping translocation breakpoint protein or prostate androgen-regulated protein (PAR) is a protein that in humans is encoded by the JTB gene. ...
   Found op http://en.wikipedia.org/wiki/JTB_(gene)
   
   
2. 
   JTB
   jump trace buffer
   Found op http://foldoc.org/JTB
   
   
3. 
   jtb
   1) Jump trace buffer
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/jtb/1
   
   

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