GENERATIONAL SEESAW MECHANISM IN [SU(6)](3)XZ(3)

For the gauge group [SU(6)]3 x Z3 which unifies nongravitational forces with flavors we analyze the generational seesaw mechanism. At the tree level we get m(nu)e = 0 and m(nu)tau is similar to m(nu)mu is similar to M(L)2/M(H), where M(L) approximately 10(2) GeV and M(H) greater-than-or-equal-to 10(5) GeV are the weak and horizontal interactions mass scales, respectively. The right-handed neutrinos get Majorana masses M(R) of the order of the scale where SU(2)R is broken. A low energy exotic neutral lepton with a mass of the order of M(H)2/M(R) is predicted. Radiative corrections can produce m(nu)e not-equal 0, four orders of magnitude smaller than the other neutrino masses.