+--------------COMP:V-N(in)-------------+    
      +------------------SUBJ:V-N-----------------+         +--------MOD_ATT:N-ADJ--------+    
      +--------COMP:N-N(of)-------+               |         |      +-----MOD_ATT:N-ADJ----+    
      |           +-MOD_ATT:N-ADJ-+               |         |      |        +MOD_ATT:N-ADJ+    
      |           |       +MOD_ATT+          +-NEG+         |      |        |        +MOD_+    
      |           |       |       |          |    |         |      |        |        |    |    
 Expression of __SP__ __NODE__ protein does not occur in mature __SP__ mesenchymal stem cells .
COMP:N-N(of) (expression,protein)
MOD_ATT:N-ADJ (protein,__SP__)
MOD_ATT:N-ADJ (protein,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,cell)
MOD_ATT:N-ADJ (cell,mature)
MOD_ATT:N-ADJ (cell,__SP__)
MOD_ATT:N-ADJ (cell,mesenchymal)
MOD_ATT:N-N (cell,stem)