A two component model describing nucleon structure functions in the low-x region

A two component model describing the electromagnetic nucleon structure functions in the low-x region, based on generalized vector dominance and color dipole approaches is briefly described. The model operates with the mesons of ρ-family having the mass spectrum of the form and takes into account the nondiagonal transitions in meson-nucleon scattering. The special cut-off factors are introduced in the model, to exclude the transitions in the case of narrow -pairs. For the color dipole part of the model the well known FKS-parameterization is used.