+----------------SUBJ:V-N----------------+                                  
      +-------COMP:N-N(of)-------+             +--------COMP:V-N(in)--------+     
      |           +-MOD_ATT:N-ADJ+             |           +--MOD_ATT:N-ADJ-+     
      |           |       +MOD_AT+        +-NEG+           |        +MOD_ATT+     
      |           |       |      |        |    |           |        |       |     
 Expression of __SP__ __NODE__ mRNA does not occur in metastatic __SP__ melanoma .
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__SP__)
MOD_ATT:N-ADJ (mRNA,__NODE__)
SUBJ:V-N (occur,expression)
NEG (occur,not)
COMP:V-N(in) (occur,melanoma)
MOD_ATT:N-ADJ (melanoma,metastatic)
MOD_ATT:N-ADJ (melanoma,__SP__)