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Analysis of methionine enkephalin in human pituitary by multi-dimensional reversed-phase high-performance liquid chromatography, radioreceptor assay, radioimmunoassay, fast atom bombardment mass spectrometry, and mass spectrometry—mass spectrometry

Mass Spectrometry—mass SpectrometryPituitary GlandEndocrine MechanismMedicineBioanalysisPhysiologyBiological Mass SpectrometryMass SpectrometryRadioreceptor AssayProtein Mass SpectrometryAnalytical ChemistryPituitary DiseaseMethionine EnkephalinEndocrinologyPharmacologyDrug Analysis