+------------SUBJ:V-N------------+----------COMP:V-N(in)----------+    
      +-------COMP:N-N(of)-------+     |         +------MOD_ATT:N-N-----+    
      |           +-MOD_ATT:N-ADJ+     |         |            +MOD_ATT:N+    
      |           |       +MOD_AT+     |         |            |   +MOD_A+    
      |           |       |      |     |         |            |   |     |    
 Expression of __SP__ __NODE__ mRNA occurs in kidney from 3 week old __SP__ .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-N (__SP__,kidney)
MOD_ATT:N-N (__SP__,week)
MOD_ATT:N-ADJ (__SP__,old)