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FtsZ is a protein that is important in cell reproduction, particularly bacteria. FtsZ is one of the proteins that builds the band (called a septum) that grows around some bacteria during fission and helps them replicate. The FtsZ protein builds a specific part of the bacterium septum called the Z ring. The structure of the septum is very specific, and it is built by a number of specific proteins. The FtsZ protein is just one of at least ten proteins that are common in bacteria cell reproduction. In addition, the FtsZ protein has been found in chloroplasts and helps the tiny parts of the plant cell divide.