Restoring universality

In models of weak and electromagnetic interactions with six or more quarks, universality and, in some cases, the V-A structure of leptonic and semi-leptonic interactions have to be put in by hand. It is shown how both properties re-emerge naturally if replacing the usual SU(2) weak isospin group by a large SU(4) group, which also lends itself quite naturally to grand unifications (including strong interactions). The model needs eight quarks and two charged heavy leptons, and features, besides universality and V-A, non-equality of neutral current scattering of γ's on leptons and on hadrons, and very reasonable relations for (bare) fermion masses. (Auth.)