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A neutralino is a proposed type of particle in theoretical models termed supersymmetry, in which there exists another set of particles analogous to known particles but differ by one quantum number, spin, the difference being 1/2. The four neutralinos are the result of quantum mixing of some of these superparticles (in a similar manner to the mixing of quarks or neutrinos). Three of the four types of neutralinos would decay quickly, but the lightest would be stable. It is a candidate-particle to serve as a WIMP, because in some models of the universe's formation (Big Bang nucleosynthesis in light of supersymmetry), the total mass of the expected remaining neutralinos would equal (within reason) the universe's current total amount of the mass that is credited to dark matter. This coincidence is termed the WIMP miracle.