+----------SUBJ:V-N---------+                        
      +----COMP:N-N(of)---+       +----COMP:V-N(in)---+    
      |           +MOD_ATT+       |        +MOD_ATT:N-+    
      |           |       |       |        |          |    
 Expression of __SP__ __NODE__ occurs in lung from __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__,lung)