+-----COMP:N-N(of)----+     
     +MOD_PRED:N-+COMP:ADJ-N(for+             +MOD_ATT+     
     |           |              |             |       |     
 __NODE__ is necessary for aggregation of __NODE__ protein .
MOD_PRED:N-ADJ (__NODE__,necessary)
COMP:ADJ-N(for) (necessary,aggregation)
COMP:N-N(of) (aggregation,protein)
MOD_ATT:N-ADJ (protein,__NODE__)