+---------COMP:V-N(in)---------+    
                           |             +--MOD_ATT:N-ADJ-+    
      +------SUBJ:V-N------+             |        +MOD_ATT+    
      +COMP:N-N(of)+       |             |        |   +MOD+    
      |            |       |             |        |   |   |    
 Expression of __NODE__ occurs in differentiated 3T3 L1 cells .
COMP:N-N(of) (expression,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-ADJ (cell,differentiate)
MOD_ATT:N-ADJ (cell,3T3)
MOD_ATT:N-N (cell,L1)