+----------------SUBJ:V-N----------------+                    
      +----------COMP:N-N(of)----------+       |                    
      |           +----MOD_ATT:N-ADJ---+       |                    
      |           |       +MOD_ATT:N-AD+       +--COMP:V-N(in)-+    
      |           |       |      +MOD_A+       |         +MOD_A+    
      |           |       |      |     |       |         |     |    
 Expression of __SP__ __NODE__ beta protein occurs in __SP__ heart .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__SP__)
MOD_ATT:N-ADJ (protein,__NODE__)
MOD_ATT:N-N (protein,beta)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,heart)
MOD_ATT:N-ADJ (heart,__SP__)