I te rehetoi o te tau o te tau 1980, ka tahuritia e Jon Davis me te raweke iranga Dana Boyd te tohu ā-Tiamana mō te whāhinetanga (ᛉ) ki te waehere ā-rua kātahi ka noho ki tētahi raupapa DNA, kātahi ka whakapuakina ki Escherichia komira.