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