  We present the results of a recent study of meson-exchange two-body currents
in lepton-nucleus inclusive scattering at various kinematics and for different
nuclei within the Relativistic Fermi Gas model. We show that the associated
nuclear response functions at their peaks scale as $A k_F^2$, for Fermi
momentum $k_F$ going from 200 to 300 MeV/c and momentum transfer $q$ from
$2k_F$ to 2 GeV/c. This behavior is different from what is found for the
quasielastic response, which scales as $A/k_F$. This result can be valuable in
the analyses of long-baseline neutrino oscillation experiments, which need to
implement these nuclear effects in Monte Carlo simulations for different
kinematics and nuclear targets.
