  The existence of right-handed neutrinos follows from theoretical consistence
of the recently suggested electroweak symmetry breaking model, based on
dynamical flavor gauge symmetry breaking. Only finite number of versions of the
model exists. They differ by the number and the flavor structure of the
right-handed neutrinos. We choose for inspection one of them, the non-minimal
version with right-handed neutrinos in sextet flavor representation, and at
some points we compare it with the minimal version. We show that a Majorana
pairing of the sextet right-handed neutrinos is responsible for the flavor
symmetry breaking, and the seesaw pattern of the neutrino mass matrix naturally
arises. The dynamically generated neutrino mass matrix spontaneously breaks the
lepton number and the chiral sterility symmetry of the right-handed neutrino
sector. As a result spectrum of majorons, neutrino composites, manifests. We
study main characteristics of both massive sterile neutrinos and majorons which
show their relevance as dark matter candidates.
