+----------COMP:V-N(in)----------+    
      +----------SUBJ:V-N---------+        +------MOD_ATT:N-N------+    
      +----COMP:N-N(of)---+       |        |            +MOD_ATT:N-+    
      |           +MOD_ATT+       |        |            |    +MOD_A+    
      |           |       |       |        |            |    |     |    
 Expression of __SP__ __NODE__ occurs in brain from 3 month old __SP__ .
COMP:N-N(of) (expression,__NODE__)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-N (__SP__,brain)
MOD_ATT:N-N (__SP__,month)
MOD_ATT:N-ADJ (__SP__,old)