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Type I and II pyoverdines. (A) Type I pyoverdine (5). (B) Type II pyoverdine (33). Chr, dihydroxyquinoline-type chromophoric group; L-(CHO)OHOrn, δN-formyl-δN-hydroxyornithine; L-cOHOrn, N-hydroxy-cyclo-ornithine; R, succinyl, succinamide, or α-ketoglutaryl residue. Figure adapted from reference 18, with permission.
