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Daily variations in circulating melatonin concentrations have been measured at monthly intervals from April to December 1986 in an Antarctic bird, the emperor penguin, Aptenodytes forsteri,(More)
Using quantitative autoradiography, the density of melatonin binding sites has been measured in the rat pars tuberalis (PT) and suprachiasmatic nuclei (SCN) every 4 h throughout a 24-hour period in(More)