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MRM of standard melatonin (233.0 − > 174.1) and 7-D melatonin IS (240.0 − > 178.1) a) Extracted blank milk b) Extracted melatonin in milk at LLOQ level c) Standard melatonin,10 pg/mL d) Extracted toned milk sample e) Extracted human milk sample f) Extracted cow milk sample
