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Seasonal distributions of Per–CrymRNA periods for the entrained oscillators. In the presence of entraining signals, the individual Per–CrymRNA oscillators are more aligned with the external 24-hour photoperiod. The period distribution for all seasons is narrowed after entrainment, and the winter population is the most synchronous, with a high synchronization index (ρ). Tavg, average period; Tstd, standard deviation.
