Hei ture kōnui, kua whakaaro nga kaitohutohu o ngā mōhiohio mō tēnā momo pū bacteria, Archaea rānei me ngā raupapa ira RNA 16S he rite ake i te 97% ki tētahi, me mātua taki e te whakaraupapatanga pītauira-DNA hei whakatau mēnā he ōrite tō rātou momo, kāore rānei.