Which protein forms the ring that pinches a dividing bacterium in two?

1. Once the two copies of the chromosome have moved apart, the cell must split. 2. Repeating units of FtsZ assemble into a ring between the two nucleoids. 3. That ring recruits the proteins that bring in new membrane and wall material. 4. A septum then grows inward until the two daughter cells separate. 5. Actin rings do this job in animal cells, which is a different mechanism. _Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.5 Prokaryotic Cell Division_