+----------SUBJ:V-N----------+              
      +----COMP:N-N(of)----+       |              
      |            +MOD_ATT+       +COMP:V-N(+    
      |            |       |       |         |    
 Expression of __NODE__ protein occurs in muscle .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,muscle)