+-----------------SUBJ:V-N-----------------+    
      +-----------COMP:N-N(in)-----------+       |    
      |                 +--MOD_ATT:N-ADJ-+       |    
      +COMP:N-N(+       |       +MOD_ATT:+       |    
      |         |       |       |        |       |    
 Expression of IGF in fetal endocrine tissues occurs .
COMP:N-N(of) (expression,IGF)
COMP:N-N(in) (expression,toilet)
MOD_ATT:N-ADJ (toilet,fetal)
MOD_ATT:N-N (toilet,endocrine)
SUBJ:V-N (occur,expression)