+--------------SUBJ:V-N-------------+                                    
      +--------COMP:N-N(of)-------+       +----------COMP:V-N(in)---------+    
      |           +-MOD_ATT:N-ADJ-+       |         +-----MOD_ATT:N-N-----+    
      |           |       +MOD_ATT+       |         |            +MOD_ATT:+    
      |           |       |       |       |         |            |        |    
 Expression of __SP__ __NODE__ protein occurs in uterus from castrated __SP__ .
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,__SP__)
MOD_ATT:N-N (__SP__,uterus)
MOD_ATT:N-ADJ (__SP__,castrate)