Z ring and constriction occurs in the last part of the cell cycle.

In 1992-3 three labs independently discovered that FtsZ was related to eukaryotic tubulin, which is the protein subunit that assembles into microtubules. This was the first discovery that bacteria have homologs of eukaryotic cytoskeletal proteins. Later work showed that FtsZ was present in, and essential for, cell division in almost all bacteria and in many but not all archaea.

Mitochondria and chloroplasts are eukaryotic organelles that originated as bacterial

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