+--------------SUBJ:V-N--------------+                        
      +----COMP:N-N(of)----+               +----COMP:V-N(in)---+    
      |            +MOD_ATT+          +-NEG+           +MOD_ATT+    
      |            |       |          |    |           |       |    
 Expression of __NODE__ protein does not occur in 6240.28Mel 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-ADJ (cell,6240.28Mel)