+----------------SUBJ:V-N----------------+                                   
      +-------COMP:N-N(of)-------+             |                                   
      |           +-MOD_ATT:N-ADJ+             +--COMP:V-N(in)--+                  
      |           |       +MOD_AT+        +-NEG+         +MOD_AT+COMP:N-N(of+      
      |           |       |      |        |    |         |      |           |      
 Expression of __SP__ __NODE__ mRNA does not occur in __SP__ islets of Langerhans .
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,islet)
MOD_ATT:N-ADJ (islet,__SP__)
COMP:N-N(of) (islet,Langerhans)