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Matter and dark matter are unified under the framework of $SU(6)\to SU(5)\times U(1)_N$. A dark-matter candidate is possible, not because it is stable,but because it has a very long lifetime, in analogy to that of the proton intheories of grand unification. A specific example is presented.

Dark Matter from $SU(6) \to SU(5) \times U(1)_N$