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" ... But just as there are two “chargeless” gluons and there are many ways to have a “chargeless” quark-antiquark combination, individual protons and neutrons within a nucleus can attract one another. Gluons (and mesons, for that matter) aren’t just exchanged between individual quarks within a proton or neutron, but can be exchanged between different protons or neutrons within a nucleus. ... "