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An antiquark is the antiparticle of a quark. Quarks and antiquarks are fundamental particles that combine to form hadrons, such as protons and neutrons. There are six types, or "flavours," of quarks: up, down, charm, strange, top, and bottom. Each quark has a corresponding antiquark with opposite charges. For example, an up quark has a charge of +2/3 e, while an up antiquark has a charge of -2/3 e. Protons are made of two up quarks and one down quark, while neutrons are made of one up quark and two down quarks. Antiquarks are not directly observable as they are always found in combination with quarks.1234

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