  The parton momentum densities in the proton are obtained from a NLO QCD
analysis of structure functions measured by HERA and fixed target experiments.
The uncertainties in these parton densities, the structure functions and
related cross sections are estimated from the experimental errors, taking into
account all correlations. Standard Model predictions for the charged current
Born cross sections at large x and Q2 are calculated and compared with recent
data from ZEUS.
