+--------------------SUBJ:V-N-------------------+    
                +--------------COMP:N-N(of)-------------+       |    
                +----COMP:N-N(of)---+                   |       |    
                |            +MOD_AT+           +MOD_ATT+       |    
                |            |      |           |       |       |    
 OMIM : An association of morbid obesity and __SP__ __NODE__ occurs .
COMP:N-N(of) (association,obesity)
COMP:N-N(of) (association,__NODE__)
MOD_ATT:N-ADJ (obesity,morbid)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,association)