+-----------SUBJ:V-N----------+                    
      +-----COMP:N-N(of)----+       |                    
      |           +MOD_ATT:N+       +--COMP:V-N(in)-+    
      |           |    +MOD_+       |         +MOD_A+    
      |           |    |    |       |         |     |    
 Expression of __SP__ Gp mRNA(s) occurs in __SP__ liver .
COMP:N-N(of) (expression,mRNA(s))
MOD_ATT:N-ADJ (mRNA(s),__SP__)
MOD_ATT:N-N (mRNA(s),Gp)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,liver)
MOD_ATT:N-ADJ (liver,__SP__)