  We present a supersymmetric standard model with three gauged Abelian
symmetries, of a type commonly found in superstrings. One is anomalous, the
other two are $E_6$ family symmetries. It has a vacuum in which only these
symmetries are broken by stringy effects. It reproduces all observed quark and
charged lepton Yukawa hierarchies, and the value of the Weinberg angle. It
predicts three massive neutrinos, with mixing that can explain both the small
angle MSW effect, and the atmospheric neutrino anomaly. The Cabibbo angle is
expressed in terms of the gauge couplings at unification. It conserves
R-parity, and proton decay is close to experimental bounds.
