+--------------SUBJ:V-N-------------+                         
            +----COMP:N-N(of)---+               +----COMP:V-N(in)----+    
   +MOD_ATT:+           +MOD_ATT+          +-NEG+        +MOD_ATT:N-N+    
   |        |           |       |          |    |        |           |    
 Basal expression of __SP__ __NODE__ does not occur in brain from __SP__ .
MOD_ATT:N-N (expression,basal)
COMP:N-N(of) (expression,__NODE__)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-N (__SP__,brain)