I have read that it can be proven experimentally and it occurs to all fermions.
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1One does not simply "mark" an electron. I assume you're talking about $SU(2)$ being the double cover of $SO(3)$. – Danu Sep 06 '15 at 08:02
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This is easily answered by a search of this site, though to be fair you need to know the electron is a spinor to know what to search for. – John Rennie Sep 06 '15 at 09:49