+------------SUBJ:V-N------------+                                
      +-------COMP:N-N(of)-------+     +--------COMP:V-N(in)-------+    
      |           +-MOD_ATT:N-ADJ+     |         +--MOD_ATT:N-ADJ--+    
      |           |       +MOD_AT+     |         |        +MOD_ATT:+    
      |           |       |      |     |         |        |        |    
 Expression of __SP__ __NODE__ mRNA occurs in __SP__ pancreatic islets .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,islet)
MOD_ATT:N-ADJ (islet,__SP__)
MOD_ATT:N-ADJ (islet,pancreatic)