+-----------SUBJ:V-N-----------+                 
      +-----COMP:N-N(of)-----+       |                 
      |           +MOD_ATT:N-+       +COMP:V-N(in)+    
      |           |    +MOD_A+       |       +MOD_+    
      |           |    |     |       |       |    |    
 Expression of __SP__ Pfk mRNA(s) occurs in B16 cells .
COMP:N-N(of) (expression,mRNA(s))
MOD_ATT:N-ADJ (mRNA(s),__SP__)
MOD_ATT:N-N (mRNA(s),Pfk)
SUBJ:V-N (occur,expression)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-N (cell,B16)