  We consider, in the context of a 331 model with a single neutral right-handed
singlet, the generation of lepton masses. At zeroth order two neutrinos and one
charged lepton are massless, while the other leptons, two neutrinos and two
charged leptons, are massive. However the charged ones are still mass
degenerate. The massless fields get a mass through radiative corrections which
also break the degeneracy in the charged leptons.
