+------------SUBJ:V-N------------+-------------COMP:V-N(in)-------------+    
      +-------COMP:N-N(of)-------+     |        +---------MOD_ATT:N-N---------+    
      |           +-MOD_ATT:N-ADJ+     |        |           +--MOD_ATT:N-ADJ--+    
      |           |       +MOD_AT+     |        |           |        +MOD_ATT:+    
      |           |       |      |     |        |           |        |        |    
 Expression of __SP__ __NODE__ mRNA occurs in tumor from __SP__ colorectal tissue .
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,toilet)
MOD_ATT:N-N (toilet,tumour)
MOD_ATT:N-ADJ (toilet,__SP__)
MOD_ATT:N-ADJ (toilet,colorectal)