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APCI-HRMS spectra data of 17-keto intermediates involved in anaerobic testosterone degradation by S. denitrificans. (A–E) In the in vivo assay, the steroid substrate was composed of [2,3,4C-13C]testosterone and unlabeled testosterone (mixed in 1:1 molar ratio). *The predicted elemental composition of individual molecular adduct ions was calculated using MassLynx Mass Spectrometry Software (Waters).
