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{\bf Studies of proton structure at HERA}

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{\bf I.Tsurin}\\
University of Antwerpen, on behalf of DESY\\
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{\it Notkestrasse 85, 22607 Hamburg, Germany\\
phone: (+49)40-8998-3678, e-mail: tsurin@mail.desy.de}
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Inclusive measurements of cross-sections and structure functions
for $ep$ scattering made at the HERA collider by the H1 and ZEUS
Collaborations are presented. These measurements are used to extract
the momentum distribution functions of quarks and the gluon in the
proton. Using inclusive cross section and ep jet data the strong
coupling constant $\alpha_S$ is determined in NLO QCD. New data are
presented on the measurement of the heavy quark distributions in the
proton based on lifetime tagging. First results are shown on cross
section measurements in polarised $e^{\pm}p$ scattering at HERA II.

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