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We report results of a new global next-to-leading order fit of partondistribution functions in which cuts on W and Q are relaxed, thereby includingmore data at high values of x. Effects of target mass corrections (TMCs),higher twist contributions, and nuclear corrections for deuterium data aresignificant in the large-x region. The leading twist parton distributions arefound to be stable to TMC model variations as long as higher twistcontributions are also included. The behavior of the d quark as x-->1 isparticularly sensitive to the deuterium corrections, and using realisticnuclear smearing models the d-quark distribution at large x is found to besofter than in previous fits performed with more restrictive cuts.

New parton distributions from large-x and low-Q^2 data