
Variation in nocturnality and circadian activity rhythms between photoresponsive F344 and nonphotoresponsive Sprague Dawley rats
Cheryl D Seroka, Cynthia E Johnson, Paul D Heideman

Failure to respond to endogenous or exogenous melatonin may cause nonphotoresponsiveness in Harlan Sprague Dawley rats
Matthew Rocco Price, Julie Anita Marie Kruse, M Eric Galvez, Annaka M Lorincz, Mauricio Avigdor, Paul D Heideman