| Quarks |
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| n | Quarks and
anti-quarks can |
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| successfully
account for all |
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| known mesons and baryons, |
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| which are each
constructed |
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| from up, down,
strange, and |
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| charm quarks. |
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| n | Quarks are
observed to occur |
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| only in
combinations of two |
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| quarks
(mesons), three quarks |
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| (baryons), and
the recently |
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| discovered
particles with five |
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| quarks (pentaquark). |
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