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Morphological changes in a Synechocystis culture. During salt stress a change in life style occurs, leading planktonic Synechocystis cells to form cell aggregations in a biofilm. The conversion of arginine to agmatine, which is the initial step in the polyamine synthesis pathway in Synechocystis, is performed by two arginine decarboxylases, Adc1 and Adc2. Spermidine contents decline when the biofilm is formed.
