+--COMP:V-N(of)--+    
                    |          +SUBJ:+    
                    |          |     |    
 Association of __NODE__ and Skp1 occurs .
COMP:V-N(of) (occur,__NODE__)
SUBJ:V-N (occur,Skp1)

      +-MOD_ATT:N-N-+MOD_ATT:N-+SUBJ:+    
      |             |          |     |    
 Association of __NODE__ and Skp1 occurs .
MOD_ATT:N-N (__NODE__,Association)
MOD_ATT:N-N (Skp1,__NODE__)
SUBJ:V-N (occur,Skp1)