+------------------------SUBJ:V-N-----------------------+    
      +------------------COMP:N-N(of)-----------------+       |    
      +--------COMP:N-N(of)--------+                  |       |    
      |             +--MOD_ATT:N-N-+                  |       |    
      |             |              |                  |       |    
 Interaction of membranes [cellular_membrane] and __NODE__ occurs .
COMP:N-N(of) (interaction,[cellular_membrane])
COMP:N-N(of) (interaction,__NODE__)
MOD_ATT:N-N ([cellular_membrane],membrane)
SUBJ:V-N (occur,interaction)