+------------------SUBJ:V-N-----------------+                               
      +--------COMP:N-N(of)-------+               +------COMP:V-N(in)-----+       
      |           +-MOD_ATT:N-ADJ-+               |          +MOD_ATT:N-AD+       
      |           |       +MOD_ATT+          +-NEG+          |     +MOD_AT+       
      |           |       |       |          |    |          |     |      |       
 Expression of __SP__ __NODE__ protein does not occur in cytotoxic T lymphocytes .
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,lymphocyte)
MOD_ATT:N-ADJ (lymphocyte,cytotoxic)
MOD_ATT:N-N (lymphocyte,T)