Mycoplasma gallisepticum strain S6 was obtained from the Chinese Veterinary Microorganism Culture Collection Center (Beijing, China). Culture media consisted of M. gallisepticum artificial medium base (Qingdao Hope Biological Technology) containing nicotinamide adenine dinucleotide and cysteine and swine serum (Guangzhou Ruite Biological) as previously described (3 (link)). Tilmicosin phosphate was a kind gift of Eastern Along Pharmaceuticals (Guangdong, China). Acetonitrile, formic acid, methanol (high-performance liquid chromatography grade), and remaining analytical grade reagents were purchased from Guangzhou Chemical Reagent.
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