  We study the reaction front for the process $A+B\to C$ in which the reagents
move subdiffusively. We propose a fractional reaction-subdiffusion equation in
which both the motion and the reaction terms are affected by the subdiffusive
character of the process. Scaling solutions to these equations are presented
and compared with those of a direct numerical integration of the equations. We
find that for reactants whose mean square displacement varies sublinearly with
time as $<r^2> \sim t^\gamma$, the scaling behaviors of the reaction front can
be recovered from those of the corresponding diffusive problem with the
substitution $t\to t^\gamma$
