+SUBJ:V-N+--OBJ:V-N-+COMP:N-N(of)+  
     |        |          |            |  
 __NODE__ decreases expression of IGF 1 .
SUBJ:V-N (decrease,__NODE__)
OBJ:V-N (decrease,expression)
COMP:N-N(of) (expression,1)

     +------OBJ:V-N------+               
     |        +MOD_ATT:N-+COMP:N-N(of)+  
     |        |          |            |  
 __NODE__ decreases expression of IGF 1 .
OBJ:V-N (__NODE__,expression)
MOD_ATT:N-N (expression,decrease)
COMP:N-N(of) (expression,1)