Minimal SO(10) GUT in 4D and its extension to 5D
  The problems of renormalizable minimal SUSY SO(10) GUT in 4D are discussed. Its highly predictivity has been charged with many observations, which urges further progresses. We show why and how broad data fittings and conceptual problems drive us to 5D and how it improves the model. 
Takeshi Fukuyama
hep-ph