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FIG. 1. Representative examples of different siderophores and their natural producers. Moieties involved in iron coordination are highlighted as follows: catecholates are in red, phenolates are in orange, hydroxamates are in pale yellow, ${alpha}$ -hydroxy-carboxylates (deriving from citrate units) are in light green, and ${alpha}$ -keto-carboxylates (deriving from 2-oxo-glutarate units) are in blue-green.

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