We present the evidence that (β1)FLβ is a nonperturbative symmetry of
Type II string theory. We argue that (β1)FLβ is a symmetry of string
theory as much as the SL(2,Z) of the Type II string is and how the branes
are mapped under the (β1)FLβ modding. NS branes are mapped into the NS
branes with the same world volume dimensions but with the different chiral
structure. Supersymmetric Dp-branes (bound with anti-Dp branes) are mapped to
unstable nonsupersymmetric Dp-branes, which has D(p-1)-branes as kink solutions
according to Horava.Comment: 6 pages, interpretation of the boundary state mapping in terms of
D-branes is clarified and a reference adde