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