Mutation rates of <i>pms1</i> metal coordination mutants on a low-copy plasmid in wild-type and <i>exo1Δ</i> strains.

*<p>Median rates of hom3-10 (Thr⁺) and lys2-10A (Lys⁺) reversion and inactivation of CAN1 (Can^R) with 95% confidence interval (CI) in square brackets and fold increase relative to complementation with pRS316-PMS1 in parentheses. For comparison, mutation rates for the <i>pms1Δ</i> strain complemented with empty vector (EV) are [Thr⁺ = 4.51×10⁻⁵, Lys⁺ = 2.77×10⁻⁴, Can^r = 9.61×10⁻⁶].