+----------COMP:V-N(in)----------+    
      +---------SUBJ:V-N--------+         +-----MOD_ATT:N-ADJ----+    
      +----COMP:N-N(of)---+     |         |     +--MOD_ATT:N-ADJ-+    
      |            +MOD_AT+     |         |     |       +MOD_ATT:+    
      |            |      |     |         |     |       |        |    
 Expression of __NODE__ mRNA occurs in __SP__ small intestine tissue .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,toilet)
MOD_ATT:N-ADJ (toilet,__SP__)
MOD_ATT:N-ADJ (toilet,small)
MOD_ATT:N-N (toilet,intestine)