How does M theory describe fermions?

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How are fermions, like electrons, described by m theory? Are they closed strings like gravitons, or are they open strings attached to a D2/M2, D4, or M5 branes?
 
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To my knowledge m-theory does not contain strings, so i think you should look for the answer in string theory. Zwiebach contains a very nice introduction to phenomenology in string theory :)
 

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