  A conventional graviton vertex operator is generated from the gauging of
global supersymmetry. If the outgoing gravitino is replaced by a fermion-boson
pair of like helicity, and if a new principle of equivalence associates
supergravity with the introduction of color, then every quark flavor can be
described as a gravitationally excited lepton. In this context, A SUSY SU(5)can
be constructed exclusively of leptons and their scaler superpartners (or of
quarks and their superpartners). This SUSY GUT flavor symmetry, which is
preserved by the proposed supergravity interactions, accounts for three
fermionic generations and predicts a new quark--aleft-handed (non-strange)
version of the strange quark.
