+-------------SUBJ:V-N------------+                     
      +----COMP:N-N(of)---+             |                     
      |            +MOD_AT+        +-NEG+COMP:V-N(+           
      |            |      |        |    |         |           
 Expression of __NODE__ mRNA does not occur in __SP__ kidney .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,__SP__)