The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons.

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Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons
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Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons).
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The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons.
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https://en.wikipedia.org/wiki/Proton
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A modern perspective has a proton composed of the valence quarks (up, up, down), the gluons, and transitory pairs of sea quarks.
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Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons).
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A modern perspective has a proton composed of the valence quarks (up, up, down), the gluons, and transitory pairs of sea quarks.
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