+--------COMP:N-N(of)-------+     
     +-------MOD_PRED:N-ADJ-------+              |           +-MOD_ATT:N-ADJ-+     
     +COMP:N-N(of)+        +MOD:AD+COMP:ADJ-N(for+           |       +MOD_ATT+     
     |            |        |      |              |           |       |       |     
 Oxidation of __NODE__ is not necessary for expression of __SP__ __NODE__ mRNA(s) .
COMP:N-N(of) (oxidation,__NODE__)
MOD_PRED:N-ADJ (oxidation,necessary)
MOD:ADJ-ADV (necessary,not)
COMP:ADJ-N(for) (necessary,expression)
COMP:N-N(of) (expression,mRNA(s))
MOD_ATT:N-ADJ (mRNA(s),__SP__)
MOD_ATT:N-ADJ (mRNA(s),__NODE__)