Table 3.

The information of coefficients for the fitted Model 1 with the response variable being BPS mutation rate

Strain	Coefficients	P	Confidence intervals
lexA3	− 8.87 × 10–5	2.83 × 10–4***	− 1.36 × 10–4	− 0.41 × 10–4
ΔmutY	6.62 × 10–4	< 2.00 × 10–16 ***	6.18 × 10–4	7.06 × 10–4
ΔmutS	2.70 × 10–3	< 2.00 × 10–16 ***	2.64 × 10–3	2.76 × 10–3

The response variable for the fitted model is the mutation rate with Box-Cox Transformation ($\lambda =0.384$), and the explanatory variable is molecular mechanism. The coefficients represent the difference in mutation rate between wild-type and each mutant strain, and the P and confidence intervals reveal coefficients’ significance. lexA3, the SOS-uninducible strain