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Any of the six different varieties of quarks. All hadronic matter is composed of quarks, the most elementary constituents of matter. The six different flavors are labeled u, d, s, c, b, and t, corresponding to up, down, strange, charmed, bottom, and top. Quarks are all spin-1/2 fermions. The u, c, and t flavors carry a positive electric charge equal in magnitude to two-thirds that of the electron; the d, s, and b flavors have a negative charge one-third that of the electron. Different flavored quarks have vastly different masses ranging from the lightest, the u quark, with a mass around 5 MeV/c2 (where c is the speed of light), equal to the mass of about 10 electrons, to the top quark, with a mass 35,000 times greater, or 175 GeV/c2, about the mass of a gold atom. Quarks of any flavor are further characterized by three additional quantum numbers called color: red, green, and blue. Each quark has an antiquark counterpart carrying the corresponding anticolor. See Antimatter, Color (quantum mechanics), Elementary particle, Quarks