+-------------SUBJ:V-N------------+                 
      +----COMP:N-N(of)---+             +COMP:V-N(in)+    
      |            +MOD_AT+        +-NEG+       +MOD_+    
      |            |      |        |    |       |    |    
 Expression of __NODE__ mRNA does not occur in EML cells .
COMP:N-N(of) (expression,mRNA)
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,EML)