Abstract
Recent measurements of the structure functions for deep inelastic scattering made by the NMC and the CCFR collaboration provide new information on parton distributions, particularly in the 0.01 < x < 0.1 interval. We describe (next-to-leading order) determinations of parton distributions whih incorporate these new data together with other deep-inelastic and related data, and which allow the possibility of flavour dependence of the light quark sea (i.e. u ≠ d ) as implied by the Gottfried sum rule. We discuss extrapolations to small x.
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