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