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UPLC-MS/MS chromatograms of RAs and 4-oxo-RAs in culture of M. flos-aquae (FACHB-1028). (Left) Standards (10 parts per billion). (Center) Extracellular sample. (Right) Intracellular sample. A, atRA; B, 13cRA; C, 9cRA; D, at-4-oxo-RA; E, 13c-4-oxo-RA; F, 9c-4-oxo-RA.
