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Radioimmunoassayable melatonin levels in the bile of six mammalian species. These values are clearly much higher than in the blood, both during the day or at night (two bars on far left). Levels of melatonin in the fluids other than the blood that exceed the concentration of this indole in the blood is not unusual. Melatonin values in several other bodily fluids and within subcellular organelles also exceed those in the blood.
