Table 3. Natural variation in egg laying in response to a gradient of low exogenous serotonin concentrations in wild type and mod-5(n822) animals (Figure 8C, Figure 8—figure supplement 1B).

Results for statistical analyses testing for the effects of and interactions between genetic background, presence of mod-5(lf) and Treatment (concentration of serotonin) on egg laying (ANOVA).

Source	DF	Sum of Squares	F Ratio	p
mod-5	1	67.45	186.42	<.0001*
Background	7	149.21	58.91	<.0001*
Treatment	3	120.21	110.73	<.0001*
mod-5 x Background	7	8.94	3.53	0.0010*
mod-5 x Treatment	3	15.77	14.53	<.0001*
Background x Treatment	21	95.77	12.60	<.0001*
mod-5 x Background x Treatment	21	13.31	1.75	0.021*
Error	510	184.55