+---------COMP:V-N(in)---------+    
      +----------SUBJ:V-N---------+         +----MOD_ATT:N-ADJ---+    
      +----COMP:N-N(of)---+       |         |      +MOD_ATT:N-ADJ+    
      |           +MOD_ATT+       |         |      |      +MOD_AT+    
      |           |       |       |         |      |      |      |    
 Expression of __SP__ __NODE__ occurs in __SP__ distal sciatic nerve .
COMP:N-N(of) (expression,__NODE__)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,nerve)
MOD_ATT:N-ADJ (nerve,__SP__)
MOD_ATT:N-ADJ (nerve,distal)
MOD_ATT:N-ADJ (nerve,sciatic)