+-------------COMP:V-N(in)-------------+      
                                   |        +---------MOD_ATT:N-N---------+      
      +----------SUBJ:V-N----------+        |        +-----MOD_ATT:N-N----+      
      +----COMP:N-N(of)----+       |        |        |      +MOD_ATT:N-ADJ+      
      |            +MOD_ATT+       |        |        |      |      +MOD_AT+      
      |            |       |       |        |        |      |      |      |      
 Expression of __NODE__ protein occurs in head and neck squamous cell carcinoma .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,carcinoma)
MOD_ATT:N-N (carcinoma,head)
MOD_ATT:N-N (carcinoma,neck)
MOD_ATT:N-ADJ (carcinoma,squamous)
MOD_ATT:N-N (carcinoma,cell)