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