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Myxochelin A is a microbial metabolite that has been found in A. disciformis and has diverse biological activities. It is active against Gram-positive bacteria, including B. cereus, S. aureus, and M. luteus, but not Gram-negative bacteria or fungi in an agar diffusion assay when used at a concentration of 80 µg/disc. Myxochelin A inhibits 5-lipoxygenase (5-LO) activity with an IC value of 1.9 µM for the recombinant human enzyme. It is cytotoxic to 26-L5 colon cancer cells when used at a concentration of 3 µg/ml.