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Activation of PHB synthase following nitrogen step down. Cells were transferred from nitrate-supplemented BG11 medium to combined-nitrogen-free BG11-N medium, and PHB synthase activity was measured in crude membrane fractions from cell lysates of the Synechocystis strain PCC 6803 wild type (filled squares) and sll0783 mutant (open squares) during the course of nitrogen starvation.
