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Waveform of CAB expression under LD cycles. Luminescence of light-grown plants entrained to LD cycles with various photoperiods (indicated in the legends). (A) LD1:23 to LD9:15; (B) LD12:12 to LD21:3. Data are representative of four experiments. Open box on time axis, light period; solid box, dark period. (A) LD1:23 and LD9:15; (B) LD12:12 and LD21:3. (B) Arrowheads indicate times of rising luminescence in LD18:6 but not LD12:12 or LD15:9 (see Discussion).
