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Effects of nitrogen availability on growth properties and pigment content of the wild type (WT) and the Δsll0822 mutant. At time 0, cells grown in normal BG11 medium were transferred to nitrogen-free medium (triangles), normal BG11 medium (circles; nitrate concentration, 17.7 mm), or nitrate-excess medium (diamonds; nitrate concentration, 70.6 mm). Changes in OD730 (A), phycocyanin content (B), and chlorophyll content (C) were monitored.
