+------------SUBJ:V-N------------+-----COMP:V-N(in)----+    
      +-------COMP:N-N(of)-------+     |      +--MOD_ATT:N-N-+    
      |           +-MOD_ATT:N-ADJ+     |      |   +MOD_ATT:N-+    
      |           |       +MOD_AT+     |      |   |     +MOD_+    
      |           |       |      |     |      |   |     |    |    
 Expression of __SP__ __NODE__ mRNA occurs in S phase Hela cells .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,S)
MOD_ATT:N-N (cell,phase)
MOD_ATT:N-N (cell,Hela)