+-------------------------SUBJ:V-N-------------------------+    
      +--------------------COMP:N-N(of)-------------------+      |    
      |                         +-------MOD_ATT:N-N-------+      |    
      +-COMP:N-N(of)+           |            +-MOD_ATT:N-N+      |    
      |             |           |            |            |      |    
 Interaction of __NODE__ and muscle phosphofructokinase [Pfk] occurs .
COMP:N-N(of) (Interaction,__NODE__)
COMP:N-N(of) (Interaction,[Pfk])
MOD_ATT:N-N ([Pfk],muscle)
MOD_ATT:N-N ([Pfk],phosphofructokinase)
SUBJ:V-N (occur,Interaction)