+-------OBJ:V-N-------+              
                    |           +MOD_ATT:N+              
                    |           |         |              
 Association of __NODE__ and kidney mitochondria occurs .
OBJ:V-N (__NODE__,mitochondrion)
MOD_ATT:N-N (mitochondrion,kidney)

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