Minimal supersymmetric SO(10) GUT with doublet Higgs
  We propose a simple supersymmetric SO(10) GUT model with only doublet Higgs scalars. The fermion mass problem is naturally solved by a new one-loop diagram. R-parity is conserved implying a stable LSP which can explain the dark matter of the universe. There are two contributions to the neutrino masses, one of which depends on the quark mass squared while the other is independent and similar to the type II see-saw mechanism. In the latter case $b-\tau$ unification implies large neutrino mixing angles. The baryon asymmetry of the universe is explained through leptogenesis. 
Utpal Sarkar