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This article is only a brief description of the subject, and is not intended to give a full explanation.
Check out the "see also" or "references" sections, or Wikipedia's article for more detail.

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Baryons are the heavy stuff of matter and most of our mass consists of baryons. In our part of the Universe the only important baryons are protons and neutrons as far as scientists know.

All baryons — protons and neutrons included — are each made up of three quarks. Antimatter baryons also exist, which are made of three antiquarks. These include antiprotons, which have a negative charge, and antineutrons which are neutral. Since antimatter is destroyed on contact with matter there aren't many of these antiparticles around.

Exotic baryons of exotic types have been proposed but their existence is completely unproved.