NONUNIVERSALITY OF STRUCTURE FUNCTIONS AND MEASUREMENT OF THE STRANGESEA DENSITY

We show that there is no real conflict between the two determinations of the strange sea density from the opposite-sign dimuon production an d from the difference of the F2 structure functions measured in neutri no and muon deep inelastic scattering. Once non-universal sea parton d ensities are introduced, which take into account the effects of differ ent mass thresholds and different longitudinal contributions, the disc repancy is shown to disappear and both sets of data are simultaneously well reproduced. No need for a large strange sea content of the nucle on emerges.