+----COMP:N-N(of)---+     
     +SUBJ:V_PASS+COMP:V_PASS+           +MOD_ATT+     
     |           |           |           |       |     
 __NODE__ is involved in activity of __NODE__ protein .
SUBJ:V_PASS-N (involve,__NODE__)
COMP:V_PASS-N(in) (involve,activity)
COMP:N-N(of) (activity,protein)
MOD_ATT:N-ADJ (protein,__NODE__)