+-------------------SUBJ:V-N------------------+                   
      +-------------COMP:N-N(of)------------+       |                   
      |           +------MOD_ATT:N-ADJ------+       |                   
      |           |       +---MOD_ATT:N-N---+       +-COMP:V-N(in)-+    
      |           |       |        +MOD_ATT:+       |        +MOD_A+    
      |           |       |        |        |       |        |     |    
 Expression of __SP__ PGC 1 ( [__NODE__] protein occurs in Hep3B cells .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__SP__)
MOD_ATT:N-N (protein,1)
MOD_ATT:N-N (protein,[__NODE__])
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,Hep3B)