+---------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 thoracic aorta 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__,thoracic)
MOD_ATT:N-N (__SP__,aorta)