+------------COMP:V-N(in)------------+    
      +---------SUBJ:V-N--------+          +-------MOD_ATT:N-N-------+    
      +----COMP:N-N(of)---+     |          |       +--MOD_ATT:N-ADJ--+    
      |            +MOD_AT+     |          |       |         +MOD_ATT+    
      |            |      |     |          |       |         |       |    
 Expression of __NODE__ mRNA occurs in monocyte derived macrophage cells .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,monocyte)
MOD_ATT:N-ADJ (cell,derive)
MOD_ATT:N-N (cell,macrophage)