The Pauli principle requires that the quark substructure of nucleons in nuclei must be accounted for in the nuclear wave function. This becomes important when one wants to calculate consistently (weak and electromagnetic) observables for which the corresponding properties for the nucleons are determined by the quark substructure, specifically the quark wave functions. This leads to exchange contributions that constitute deviations from the simple impulse approximation description. For instance, in the nuclear form factors it destroys the factorization in a body form factor and the nucleon form factor. Examples of the effects on the elastic form factors of the A ⩽ 4 systems are shown.
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