  The natural interpretation of deep inelastic scattering is in terms of hard
scattering on QCD constituents of the target. We examine the relation between
amplitudes measured in exclusive lepto-production and the quark content of the
nucleon. We show that in the Bjorken limit, the natural interpretation of
amplitudes measured in these hard exclusive processes is in terms of the quark
content of the meson cloud and not the target itself. Therefore the most
efficient representation of these exclusive processes is in terms of leading
Regge amplitudes.

High Energy Physics - Phenomenology