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The quark spin densities related to generalized parton distributions inimpact-parameter space and to transverse-momentum dependent partondistributions are reviewed within a light-cone quark model, with focus on therole of the different spin-spin and spin-orbit correlations of quarks.Resultsfor azimuthal spin asymmetries in semi-inclusive deep-inelastic scattering dueto T-even transverse-momentum dependent parton distributions are alsodiscussed.

The spin structure of the nucleon in light-cone quark models