  Arkani-Hamed, Dimopoulos, and Dvali have proposed that the fundamental
gravitational scale is close to 1 TeV, and that the observed weakness of
gravity at long distances is explained by the presence of large extra compact
dimensions. If this scenario is realized in a string theory of quantum gravity,
the string excited states of Standard Model particles will also have TeV
masses. These states will be visible to experiment and in fact provide the
first signatures of the presence of a low quantum gravity scale. Their presence
also affects the more familiar signatures due to real and virtual graviton
emission. We study the effects of these states in a simple string model.
