Table 2.

UV-induced mutagenesis of S. cerevisiae strains

Strain (genotype)	UV dose, J/m2	Viability, %	Reversion frequency* per 107 viable cells
DBY747	0	100	4.8  ±  0.8
(wild type)	2	100	20.2  ±  3.4
	4	100	29.2  ±  2.6
	6	96	36.0  ±  8.4
	10	92	65.8  ±  1.3
SBU	0	100	18.6  ±  0.4
(mms2)	2	93	45.5  ±  8.0
	4	92	65.0  ±  5.0
	6	82	72.5  ±  3.6
	10	80	119.2  ±  24.4

^*DBY747 and SBU are isogenic strains carrying the trp1-289 mutation. Trp⁺ revertants were scored as the mean ± SD of at least two independent experiments.