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Cluster I, genes upregulated under nitrogen limitation; GlnD-GlnB/K dependent; Cluster I (circle), genes upregulated under nitrogen limitation, GlnD-GlnB/K independent; Cluster II, genes downregulated under nitrogen limitation; Cluster III, genes with expression affected by GlnD/GlnBK regulatory cascade but not differentially expressed under high vs. low nitrogen.
