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Protons are fundamental particles that make up the nucleus of an atom along with neutrons. They carry a positive charge and are crucial in determining the atomic number of an element. The number of protons in an atom defines its identity on the periodic table. 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, one of the four fundamental forces in nature. In particle accelerators, scientists can manipulate protons to study their behavior and interactions with other particles. Protons are used in various applications, such as in medical treatments like proton therapy for cancer patients. In conclusion, protons are the building blocks of matter and play a vital role in the structure of atoms. Understanding their properties and behavior helps scientists unlock the secrets of the universe.