+-----------------------SUBJ:V-N----------------------+                    
      +--------------COMP:N-N(of)-------------+             |                    
      |           +-------MOD_ATT:N-ADJ-------+             +--COMP:V-N(in)-+    
      |           |       +---MOD_ATT:N-ADJ---+             |       +MOD_ATT+    
      |           |       |           +MOD_ATT+        +-NEG+       |  +MOD_+    
      |           |       |           |       |        |    |       |  |    |    
 Expression of __SP__ __NODE__ 7 [__NODE__] mRNA does not occur in C4 2B4 cells .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
MOD_ATT:N-N (mRNA,[__NODE__])
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,C4)
MOD_ATT:N-ADJ (cell,2B4)