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" ... Every lepton and antilepton has been seen by detectors, with the tau neutrino (and its antimatter counterpart, the tau antineutrino) completing the lepton sector in the early-to-mid 2000s. ... "
" ... In the early Universe, the full suite of particles and their antimatter particles were ... [+] extraordinarily abundant, but as they Universe cooled, the majority annihilated away. All the conventional matter we have left over today is from the quarks and leptons, with positive baryon and lepton numbers, that outnumbered their antiquark and antilepton counterparts. ... "