by Nanne Nan­ninga — The com­mon pic­ture of a di­vid­ing rod-shaped bac­terium en­com­passes the po­si­tion­ing of the di­vi­some, in­clud­ing an FtsZ-ring, in the cell cen­ter. This oc­curs af­ter the cell has dou­bled its length with­out in­creas­ing its di­am­e­ter. Con­versely, in­crease in di­am­e­ter with­out cell elon­ga­tion would seem highly un­likely in a rod-shaped…