  Measurements of the EMC effect show that the quark distributions in nuclei
are not simply the sum of the quark distributions of the constituent nucleons.
However, interpretation of the EMC effect is limited by the lack of a reliable
baseline calculation of the effects of Fermi motion and nucleon binding. We
present preliminary results from JLab experiment E03-103, a precise measurement
of the EMC effect in few-body and heavy nuclei. These data emphasize the
large-x region, where binding and Fermi motion effects dominate, and thus will
provide much better constraints on the effects of binding. These data will also
allow for comparisons to calculations for few-body nuclei, where the
uncertainty in the nuclear structure is minimized.
