+--------COMP:N-N(of)-------+     
     +-----SUBJ:V-N-----+          |           +-MOD_ATT:N-ADJ-+     
     +COMP:N-N(o+       +--OBJ:V-N-+           |       +MOD_ATT+     
     |          |       |          |           |       |       |     
 Depletion of serum increases expression of __SP__ __NODE__ protein .
COMP:N-N(of) (depletion,serum)
SUBJ:V-N (increase,depletion)
OBJ:V-N (increase,expression)
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__SP__)
MOD_ATT:N-ADJ (protein,__NODE__)