+----------------SUBJ:V-N----------------+---------COMP:V-N(in)---------+    
      +-------COMP:N-N(of)-------+             |         +----MOD_ATT:N-ADJ---+    
      |           +-MOD_ATT:N-ADJ+             |         |       +MOD_ATT:N-AD+    
      |           |       +MOD_AT+        +-NEG+         |       |       +MOD_+    
      |           |       |      |        |    |         |       |       |    |    
 Expression of __SP__ __NODE__ mRNA does not occur in __SP__ embryonic stem cells .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-ADJ (cell,__SP__)
MOD_ATT:N-ADJ (cell,embryonic)
MOD_ATT:N-N (cell,stem)