  We analyze the role of meson exchange currents (MEC) in photon- and
electron-induced one nucleon emission reactions in a fully relativistic model.
The relativistic mean field theory is used for the bound state and the Pauli
reduction for the scattering state. Direct 1-body and exchange 2-body terms in
the nuclear current are considered. Results for the 12C(gamma,p) and
16O(gamma,p) differential cross sections and photon asymmetries are displayed
in an energy range between 60 and 196 MeV. The 2-body seagull current affects
the cross section less than in nonrelativistic analyses. In the case of the
16O(gamma,n) differential cross section MEC effects are large but not
sufficient to reproduce the data. MEC have a small effect on (e,e'p)
calculations.
