Failure to respond to endogenous or exogenous melatonin may cause nonphotoresponsiveness in Harlan Sprague Dawley rats

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Matthew R Price, Julie AM Kruse, M Eric Galvez, Annaka M Lorincz, Mauricio Avigdor and Paul D Heideman^*

Journal of Circadian Rhythms 2005, 3:12 doi:10.1186/1740-3391-3-12