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Diagram of proposed interactions that regulate the induction response to nitrogen starvation in Anabaena. See the text for details. Abbreviations: NH3, ammonia; Trp, tryptophan; Glu, glutamate; Gln, glutamine; TrpG, glutamine amidotransferase; TrpE, anthranilate synthase; TrpD, anthranilate phosphoribosyltransferase; TrpC, indole-3-glycerol-phosphate synthase; TrpA and TrpB, tryptophan synthase (described in the order in which reactions occur during tryptophan biosynthesis).
