  There is current interest in a possible new massive gauge boson $X$ which
mixes slightly with the $Z$ boson and accounts for certain anomalies in the LEP
data. We show why constraints on models in which the $X$ boson does not couple
to the first two families suggest dynamical electroweak symmetry breaking. The
associated TeV mass fermions make up a fourth family. Constraints on the
effects of the fourth left-handed neutrino also suggest a dynamical origin for
its Majorana mass. We finally comment on related implications for the origin of
quark masses.
