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