+--------------SUBJ:V-N-------------+---------COMP:V-N(in)---------+    
      +--------COMP:N-N(of)-------+       |         +----MOD_ATT:N-ADJ---+    
      |           +-MOD_ATT:N-ADJ-+       |         |      +MOD_ATT:N-ADJ+    
      |           |       +MOD_ATT+       |         |      |      +MOD_AT+    
      |           |       |       |       |         |      |      |      |    
 Expression of __SP__ __NODE__ mRNA(s) occurs in __SP__ mammary gland tissue .
COMP:N-N(of) (expression,mRNA(s))
MOD_ATT:N-ADJ (mRNA(s),__SP__)
MOD_ATT:N-ADJ (mRNA(s),__NODE__)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,toilet)
MOD_ATT:N-ADJ (toilet,__SP__)
MOD_ATT:N-ADJ (toilet,mammary)
MOD_ATT:N-N (toilet,gland)