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