  The effects of nuclear binding on nuclear structure functions have so far
been studied mainly at fixed target experiments, and there is currently much
interest in obtaining a clearer understanding of this phenomenon. We use an
existing dynamical model of nuclear structure functions, that gives good
agreement with current data, to study this effect in a kinematical regime (low
$x$, high $Q^2$) that can possibly be probed by an upgrade of {\sc hera} at
{\sc desy} into a nuclear accelerator.
