+-----------COMP:V-N(in)-----------+    
      +----------SUBJ:V-N---------+         +-------MOD_ATT:N-N------+    
      +----COMP:N-N(of)---+       |         |              +MOD_ATT:N+    
      |           +MOD_ATT+       |         |              |   +MOD_A+    
      |           |       |       |         |              |   |     |    
 Expression of __SP__ __NODE__ occurs in retina from 00.0 day old __SP__ .
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-N (__SP__,retina)
MOD_ATT:N-N (__SP__,day)
MOD_ATT:N-ADJ (__SP__,old)