+---------SUBJ:V-N--------+----------COMP:V-N(in)----------+    
      +----COMP:N-N(of)---+     |           +----MOD_ATT:N-ADJ---+    
      |            +MOD_AT+     |           |        +MOD_ATT:N-N+    
      |            |      |     |           |        |           |    
 Expression of __NODE__ mRNA occurs in mesenteric artery from __SP__ .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,__SP__)
MOD_ATT:N-ADJ (__SP__,mesenteric)
MOD_ATT:N-N (__SP__,artery)