+---COMP:V-N(In)---+         +----COMP:N-N(of)---+     
       +MOD_A+         +SUBJ:V-N+-OBJ:V-N-+           +MOD_ATT+     
       |     |         |        |         |           |       |     
 In muscle cells , __NODE__ decreases activity of __NODE__ protein .
MOD_ATT:N-N (cell,muscle)
COMP:V-N(In) (decrease,cell)
SUBJ:V-N (decrease,__NODE__)
OBJ:V-N (decrease,activity)
COMP:N-N(of) (activity,protein)
MOD_ATT:N-ADJ (protein,__NODE__)