+-----MOD_ATT:N-N-----+---------SUBJ:V-N--------+               
    |   +---MOD_ATT:N-N---+----COMP:N-N(of)---+     |               
    |   |      +MOD_ATT:N-+            +MOD_AT+     +-OBJ:V-N+      
    |   |      |          |            |      |     |        |      
 IL 1 beta decreases expression of __NODE__ mRNA levels [__NODE__] .
MOD_ATT:N-N (expression,1)
MOD_ATT:N-N (expression,beta)
MOD_ATT:N-N (expression,decrease)
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (level,expression)
OBJ:V-N (level,[__NODE__])