Table 1.

Activity rhythms of per⁰¹; CRS/hs/cper and per⁰¹; CRS/P/cper flies

Genotype	Line	Number tested	Percent rhythmic (%)	Average period (hr ± SEM)	Average power (±SEM)
CRS/hs/cper	4	20	90	23.1 ± 0.1	53.3 ± 7.5
	5	16	81.8	22.7 ± 0.2	40.2 ± 7.6
	10	16	93.8	22.3 ± 0.3	29.8 ± 3.8
	19	20	50	22.5 ± 0.2	30.9 ± 4.9
	pooled	72	77.8	22.7 ± 0.1	40.0 ± 3.5
CRS/P/cper	1a	10	60	23.9 ± 0.3	38.9 ± 3.4
	2a	10	100	23.3 ± 0.3	54.5 ± 6.9
	3	10	80	26.0 ± 0.2	65.3 ± 14.2
	1	10	90	25.4 ± 0.1	66.6 ± 9.1
	2	10	100	24.2 ± 0.1	43.4 ± 5.1
	pooled	50	86	24.5 ± 0.2	54.3 ± 4.0
Canton-S		18	94.7	24.2 ± 0.1	78.2 ± 4.2

Young male Canton-S, per⁰¹; CRS/hs/cper and per⁰¹; CRS/P/cper flies were entrained in 12 hr light/dark cycles for 3/d, and locomotor activity was monitored in constant darkness at 25°C for 7/d. Periodogram analysis was done as previously described (Hamblen et al., 1986). Power and width are defined in Frisch et al. (1994) and were used to distinguish between rhythmic and arrhythmic flies (Cheng et al., 1998).