+MOD_ATT:N+SUBJ:V-N+--OBJ:V-N-+COMP:N-N(+   
     |         |        |          |         |   
 Exogenous __NODE__ decreases expression of RNA .
MOD_ATT:N-N (__NODE__,exogenous)
SUBJ:V-N (decrease,__NODE__)
OBJ:V-N (decrease,expression)
COMP:N-N(of) (expression,RNA)