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