+------------------------COMP:V-N(In)------------------------+                                  
      |                +------------------SUBJ:V-N-----------------+                                  
      |                +--------------APPOS-------------+          |                                  
      |                |                +-MOD_ATT:N-ADJ-+          |          +----COMP:N-N(of)---+   
      |        +MOD_ATT+                |        +MOD_AT+          +--OBJ:V-N-+            +MOD_AT+   
      |        |       |                |        |      |          |          |            |      |   
 In liver , mutant __NODE__ gene ( unspecified null mutation ) increases expression of __NODE__ mRNA .
MOD_ATT:N-ADJ (__NODE__,mutant)
APPOS (__NODE__,mutation)
MOD_ATT:N-ADJ (mutation,unspecified)
MOD_ATT:N-ADJ (mutation,null)
COMP:V-N(In) (increase,liver)
SUBJ:V-N (increase,__NODE__)
OBJ:V-N (increase,expression)
COMP:N-N(of) (expression,mRNA)
MOD_ATT:N-ADJ (mRNA,__NODE__)