+------------SUBJ:V-N------------+-------------------COMP:V-N(in)------------------+    
      +-------COMP:N-N(of)-------+     |                          +-----MOD_ATT:N-ADJ----+    
      |           +-MOD_ATT:N-ADJ+     |                          |         +MOD_ATT:N-AD+    
      |           |       +MOD_AT+     |            +-MOD:ADJ-ADV-+         |     +MOD_AT+    
      |           |       |      |     |            |             |         |     |      |    
 Expression of __SP__ __NODE__ mRNA occurs in spontaneously hypertensive __SP__ heart tissue .
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,toilet)
MOD:ADJ-ADV (hypertensive,spontaneously)
MOD_ATT:N-ADJ (toilet,hypertensive)
MOD_ATT:N-ADJ (toilet,__SP__)
MOD_ATT:N-N (toilet,heart)