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The last years have witnessed an impressive effort—in theoretical work, experimental measurements and data analysis—towards a deeper and better understanding of the proton and neutron structure in terms of their elementary constituents, quarks and gluons. Much progress, beyond the usual simple QCD representation of a fast moving nucleon as a bunch of collinear partons, has been achieved. Fundamental issues, like the intrinsic and orbital motion of quarks inside a proton, its coupling to the parton spin and to the parent proton spin, have been raised and investigated. The transverse, with respect to the direction of motion, degrees of freedom of partons, both in spin and motion, are best suited to study the nucleon internal properties. A new QCD picture of protons and neutrons is slowly emerging.
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