PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 19932817-0 2009 A liquid chromatography-tandem mass spectrometry confirmatory assay for the simultaneous determination of several tetracyclines in milk considering keto-enol tautomerism and epimerization phenomena. keto-enol 148-157 Weaning weight-maternal milk Bos taurus 131-135