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LC-MS/MS MRM chromatograms of spiked pig feces sample with all analyzed compounds at first validation level (trimethoprim—25 µg/kg; oxytetracycline, tetracycline, chlortetracycline, doxycycline, tylosin, tiamulin—100 µg/kg; lincomycin—125 µg/kg; enrofloxacin, ciprofloxacin—50 µg/kg).
