|Antimatter fundamental constituents|
To the four fondamental constituents of ordinary matter, corresponds in antimatter four constituants which are their antiparticles. The first one, the positron (or positon) is the more visible. The antineutrino, produced abundantly in beta-minus decays, but virtually undetectable. The antiquarks are the constituents of antiprotons and antineutrons the antiparticles of protons and neutrons of nuclei.