+------MOD_ATT:N-N------+            
      |             +MOD_ATT:N+SUBJ:V-+    
      |             |         |       |    
 Association of Grb 2 and __NODE__ occurs .
MOD_ATT:N-N (__NODE__,Association)
MOD_ATT:N-N (__NODE__,2)
SUBJ:V-N (occur,__NODE__)

                    +---COMP:V-N(of)--+    
                    |         +SUBJ:V-+    
                    |         |       |    
 Association of Grb 2 and __NODE__ occurs .
COMP:V-N(of) (occur,2)
SUBJ:V-N (occur,__NODE__)