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