+---------------COMP:V-N(in)---------------+    
      +------------SUBJ:V-N------------+         +-----------MOD_ATT:N-N----------+    
      +-------COMP:N-N(of)-------+     |         |      +-------MOD_ATT:N-N-------+    
      |           +-MOD_ATT:N-ADJ+     |         |      |              +MOD_ATT:N-+    
      |           |       +MOD_AT+     |         |      |              |    +MOD_A+    
      |           |       |      |     |         |      |              |    |     |    
 Expression of __SP__ __NODE__ mRNA occurs in thyroid gland from 3 4 month old __SP__ .
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,__SP__)
MOD_ATT:N-N (__SP__,thyroid)
MOD_ATT:N-N (__SP__,gland)
MOD_ATT:N-N (__SP__,month)
MOD_ATT:N-ADJ (__SP__,old)