+--------------SUBJ:V-N--------------+                       
      +----COMP:N-N(of)----+               +---COMP:V-N(in)---+    
      |            +MOD_ATT+          +-NEG+          +MOD_ATT+    
      |            |       |          |    |          |       |    
 Expression of __NODE__ protein does not occur in skeletal muscle .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,muscle)
MOD_ATT:N-ADJ (muscle,skeletal)