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I study, in the leptonic sector, the role of the $SU(2)_V$ custodial symmetry$\ti{\cal G}$ which was shown in ref. [1] to control the quantization of theelectric charge in the $J=0$ mesonic sector. The electroweak theory isconsidered, according to ref. [2], as a purely vectorial model which interactswith a ``hidden'' sector of composite scalars. $\ti{\cal G}$ can only be asymmetry of the former if the neutrino is a Majorana particle; the latterprovides a dynamical modification of the leptonic weak couplings,reconstructing those of the Standard Model with a massless Majorana neutrino.Comment: 11 pages, Late

LEPTONIC CUSTODIAL SYMMETRY, QUANTIZATION OF THE ELECTRIC CHARGE AND THE NEUTRINO IN THE STANDARD MODEL