+----------------SUBJ:V-N----------------+                      
      +-------COMP:N-N(of)-------+             +---COMP:V-N(in)--+    
      |           +-MOD_ATT:N-ADJ+             |        +MOD_ATT:+    
      |           |       +MOD_AT+        +-NEG+        |   +MOD_+    
      |           |       |      |        |    |        |   |    |    
 Expression of __SP__ __NODE__ mRNA does not occur in Ccrf cem 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-N (cell,Ccrf)
MOD_ATT:N-N (cell,Cem)