The anomalies that would break Baryon number conservation
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allowing violation of the conservation of Baryon number, and thus permitting proton decay.
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in isolation; they can be found only within hadrons, which include Baryons(such as protons and neutrons) and mesons.
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The total amount of matter in the universe(including Baryons and dark matter), as measured from the CMB spectrum, accounts for only about 30% of the critical density.