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