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STS-135 was extensively metabolized in HLMs and HIMs. Screening assays indicated CYP3A4 and CYP3A5 could be responsible for STS-135's oxidation. Through incubations with genotyped HLMs, CYP3A4 was identified as the primary oxidative enzyme. Interestingly, CYP2J2, a P450 isoform expressed in cardiovascular tissues, showed high activity towards the formation of M25 with a Km value of 11.4 μmol/L. Thus, it was concluded that STS-135 was primarily metabolized by CYP3A4 but may have extrahepatic metabolic pathways as well. Upon exposure to S