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Protons are one of the fundamental building blocks of the universe, along with neutrons and electrons. They are found within the nucleus of an atom, where they carry a positive electric charge. The number of protons in an atom determines its atomic number, which in turn defines the element. Protons are made up of even smaller particles called quarks, specifically two up quarks and one down quark. These quarks are held together by the strong nuclear force, which is one of the four fundamental forces in nature. Although protons are stable particles, they can be transformed into other particles through processes such as beta decay. In fact, scientists have been able to study the inner workings of protons using particle accelerators and detectors, shedding light on the mysteries of the subatomic world. Overall, protons play a crucial role in the structure of matter and are essential for understanding the nature of the universe.