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An up-to-date global QCD analysis of high energy lepton-hadron andhadron-hadron interactions is performed to better determine the gluon and quarkparton distributions in the nucleon. Improved experimental data on inclusivejet production, in conjunction with precise deep inelastic scattering data,place good constraints on the gluon over a wide range of x; while new data onasymmetries in Drell-Yan processes contribute to better determine the d/uratio. Comparisons with results of other recent global analyses are made, andthe differences are described. Open issues and the general problem ofdetermining the uncertainties of parton distributions are discussed.Comment: 18 pages in 2up format, 21 figures; This is the version to appear in  publication (to appear in Eur. Phys. J. C): minor text modifications; some  figures improved in quality; note added in proof concerning QCD evolution  adde

Global QCD analysis of parton structure of the nucleon: CTEQ5 parton distributions