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Recent heavy quark production results in deep inelastic scattering and photoproduction from the HERA colliding-beam experiments, H1 and ZEUS, are presented. Perturbative QCD at NLO is, in general, capable of reproducing the measured differential cross sections. The exploitation of the full data sample and the combination of various data-sets has allowed very precise determinations of the F b ¯ b 2 and F c ¯ c 2 structure functions. In the MS renormalisation scheme of QCD, heavy quark masses mc;b are expressed as functions of an enery scale parameter mc;b(m). The value of mb(mb) has been determined for the first time at a not-purely-leptonic collider. The running of mc with the Q 2 scale has been also established for the first time.

Beauty contribution to the proton structure function and charm results