Magnolol (CAS No: B21086) was obtained from Yuanye Biotech (Shanghai, China) with purity > 98%. Magnolol stock solution was prepared with dimethyl sulfoxide (DMSO) to 5 mM. The working solutions were diluted in E. Coli OP50 at final concentrations of 2.5, 5, 10, 20 and 50 μM.
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