+--------------SUBJ:V-N--------------+                     
      +----COMP:N-N(of)----+               +--COMP:V-N(in)--+    
      |            +MOD_ATT+          +-NEG+         +MOD_AT+    
      |            |       |          |    |         |      |    
 Expression of __NODE__ protein does not occur in Colo320 cells .
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,cell)
MOD_ATT:N-N (cell,Colo320)