+---OBJ:V-N---+     +------COMP:V_PASS-N(in)-----+                          
    +OBJ:V-N+       +SUBJ:V_PASS+             +-MOD_ATT:N-ADJ+MOD_POST:+                
    |       |       |     |     |             |              |         |                
 __SP__ __NODE__ protein is involved in morphological differentiation of mammary gland .
OBJ:V-N (__SP__,__NODE__)
OBJ:V-N (be,__NODE__)
SUBJ:V_PASS-N (involve,protein)
COMP:V_PASS-N(in) (involve,differentiation)
MOD_ATT:N-ADJ (differentiation,morphologic)
MOD_POST:N-ADJ (differentiation,of)