User:Renamed user JfgEhAE6VG/Periseptal annulus

Periseptal annuli are structures found in bacteria which participate in the formation of a septum during cell division. They are differentiated regions of the cell membrane which form concentric rings which flank the site of fission. The region between the annuli constitutes a discrete compartment referred to as the "periseptal domain," within which a septum forms during binary fission.