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According to recent studies, Parton Distribution Functions (PDFs) andGeneralized Parton Distributions (GPDs) can be evaluated in a Constituent QuarkModel (CQM) scenario, considering the constituent quarks as composite objects.In here, a fully covariant model for a system of two particles, together withits non relativistic limit, are used to calculate PDFs and GPDs. The analysispermits to realize that by no means the effects of Relativity can be simulatedtaking into account the structure of the constituent particles, the two effectsbeing independent and necessary for a proper description of available highenergy data in terms of CQM.Comment: 15 pages, 6 figures; misprints corrected in the Introduction; final  version to appear in Phys. Rev.

Relativity and constituent quark structure in model calculations of parton distributions