+--------------SUBJ:V-N-------------+                         
      +--------COMP:N-N(of)-------+       |                         
      |           +-MOD_ATT:N-ADJ-+       +----COMP:V-N(in)----+    
      |           |       +MOD_ATT+       |        +MOD_ATT:N-N+    
      |           |       |       |       |        |           |    
 Expression of __SP__ __NODE__ protein occurs in brain from __SP__ .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__SP__)
MOD_ATT:N-ADJ (protein,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-N (__SP__,brain)