Dear @anna, yes, the electron is pretty likely to be the last “remainder” of a black hole. Before it becomes an electron, the black hole may be a W boson that decays into an electron and a neutrino. Before it was a W boson, it could have been a much more excited string state… – Lubos Motl Feb 28 ’11 at 8:18
     
… the conclusion that black hole microstates are continuously connected to (other) elementary particle species – there’s no qualitative difference – doesn’t really depend on specific features of string theory. It’s a general fact that strings just confirm and make more specific.

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— Mar 1 ’11 at 15:20

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2014.07.21 Monday ACHK