+----------SUBJ:V-N---------+---------COMP:V-N(in)--------+       
      +----COMP:N-N(of)---+       |         +---MOD_ATT:N-ADJ---+       
      |           +MOD_ATT+       |         |        +MOD_ATT:N-+       
      |           |       |       |         |        |          |       
 Expression of __SP__ __NODE__ occurs in __SP__ peritoneal macrophages .
COMP:N-N(of) (expression,__NODE__)
MOD_ATT:N-ADJ (__NODE__,__SP__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,macrophage)
MOD_ATT:N-ADJ (macrophage,__SP__)
MOD_ATT:N-ADJ (macrophage,peritoneal)