[en] The minimal Standard Model exhibits a nontrivial chiral U(2) symmetry if the VEV and the hypercharge splitting Δ=(y_R^u-y_R^d)/2 of right-handed leptons (quarks) in a family vanish and Q=T₀+Y independently in each helicity sector. As a generalization, we start with SU(2)_LxSU(2)_RxU(1)_(B-L) and introduce Δ as a continuous parameter which is a measure of explicit symmetry breakdown. Values 0≤Δ≤1/2 take the neutral generator of the isospin-1/2 representation to the singlet representation, i.e. 'deformes' the LR representation into the minimal Standard one. The corresponding classical O(3)-breaking term is a magnetic field perpendicular to the x₃-axis. A simple mapping on the fundamental Drinfeld-Jimbo q-deformed SU(2) representation is given. (orig.)