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Photostimulation at 22 weeks of age was done with either a normal, hemeral day (14 hours of light; 10 hours of darkness) or a long ahemeral day (14 hours of light; 14 hours of darkness).
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hemeral
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ahemeral — adjective Cyclical, with a period not equal to 24 hours Photostimulation at 22 weeks of age was done with either a normal, hemeral day (14 hours of light; 10 hours of darkness) or a long ahemeral day (14 hours of light; 14 hours of darkness). See … Wiktionary