+----------------SUBJ:V-N----------------+                                                                 
      +-------COMP:N-N(of)-------+             |                 +---------------COMP:N-N(of)---------------+    
      |           +-MOD_ATT:N-ADJ+             +---COMP:V-N(in)--+----------OBJ:V-N----------+              |    
      |           |       +MOD_AT+        +-NEG+         +MOD_ATT+         +MOD_ATT+-SUBJ:V-N+       +MOD_AT+    
      |           |       |      |        |    |         |       |         |       |         |       |      |    
 Expression of __SP__ __NODE__ mRNA does not occur in retinal pigment epithelial cells from eye of fetal __SP__ .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,pigment)
MOD_ATT:N-ADJ (pigment,retinal)
COMP:N-N(of) (pigment,__SP__)
MOD_ATT:N-ADJ (cell,epithelial)
OBJ:V-N (eye,pigment)
SUBJ:V-N (eye,cell)
MOD_ATT:N-ADJ (__SP__,fetal)