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Matter composed of elementary particles that have masses and spins identical to those of the particles that make up ordinary matter, but with many other properties, such as electric charge, reversed. Although some antiparticles are observed in nature and others are produced in the laboratory, there is no evidence for the existence of large amounts of antimatter, for example, in the form of "antihydrogen". If ordinary matter and antimatter were to meet, they would annihilate each other with the release of energy.
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