SUGRA interactions at thresholds of asymptotic freedom
  A generic heterotic string theory is uniquely reduced to the standard model in terms of a geometry that transcends compactification. This device also extends the standard model to embrace three generations of fermions, including a left-handed strange quark that is devoid of strangeness and three right-handed neutrinos. Finally the proposed hypothesis indicates supergravitationally mediated quark-lepton transitions that preserve baryon structure, departing from the SUSY GUT tradition that predicts proton decay. 
J. Towe