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