One of these involves fusion between cells from domains Archaea and Bacteria ... Like Cell Biology of a Bacterium Planctomycete cell structure differs from that of all other known prokaryotes.

Indeed, archaea and bacteria appear very similar biologically (members of both groups consist of tiny cells without much internal structure) and different from eukaryotes. However, until ...

Scientists know relatively little about archaea compared to their bacterial counterparts ... “Is there any direct interaction with human cells, like epithelial cells of the gut?” Albers wondered.

Archaea—one of the three primary domains of life alongside bacteria and eukaryotes—are often overlooked and sometimes mistaken for bacteria due to their single-celled nature and lack of a nucleus.