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We present a renormalizable non supersymmetric Grand Unified SO(10) modelwhich, at the price of a large fine tuning, is compatible with all compellingphenomenological requirements below the unification scale and thus realizes aminimal extension of the SM, unified in SO(10) and describing all known physicsbelow $M_{GUT}$. These requirements include coupling unification at a largeenough scale to be compatible with the bounds on proton decay; a Yukawa sectorin agreement with all the data on quark and lepton masses and mixings and withleptogenesis as the origin of the baryon asymmetry of the Universe; an axionarising from the Higgs sector of the model, suitable to solve the strong CPproblem and to account for the observed amount of Dark Matter. The aboveconstraints imposed by the data are very stringent and single out a particularbreaking chain with the Pati-Salam group at an intermediate scale$M_I\sim10^{11}$ GeV.

A non Supersymmetric SO(10) Grand Unified Model for All the Physics below $M_{GUT}$