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. 2022 Dec 12;36(4):777–797. doi: 10.1007/s10534-022-00480-8

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Fig. 3 — Currently known secondary siderophores in Pseudomonas spp. (Cornelis 2010). a Secondary siderophores for which structural variants have been described: pyochelin (2) vs. enantio-pyochelin (3), ornicorrugatin (4) vs. corrugatin (5), quinolobactin (6) vs. thio-quinolobactin (7). Some of these variants—pyochelin vs. enantio-pyochelin—are known to confer specificity with regard to the uptake of the iron-loaded siderophores. b Secondary siderophores for which a single structural variant exists: achromobactin (8), PDTC (9), yersiniabactin (10), pseudomonine (11)