+-----------SUBJ:V-N-----------+                
      +-----COMP:N-N(of)-----+       +COMP:V-N(in+    
      |             +MOD_ATT:+       |       +MOD+    
      |             |        |       |       |   |    
 Expression of Glycogenin mRNA(s) occurs in YT cells .
COMP:N-N(of) (expression,mRNA(s))
MOD_ATT:N-N (mRNA(s),Glycogenin)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,YT)