Table 1.

Mutation frequency of pLS76 wt following treatment with UV light and replication in yIG397

UV dose, J/m2	Trial	Red/total colonies*	Mutation frequency†
0	1	67/230,660
	2	80/206,125
	3	62/226,435	(3.2 ± 0.6) × 10−4
50	1	141/170,325
	2	105/128,400
	3	120/157,715	(8.0 ± 0.4) × 10−4
150	1	130/60,835
	2	136/59,520
	3	166/76,670	(2.2 ± 0.1) × 10−3
300	1	120/22,480
	2	127/16,545
	3	158/37,730	(5.7 ± 1.8) × 10−3

^*Each value represents the sum of multiple transformations. In 8 of the 9 sets of transformations of treated DNA, the number of mutants did not vary significantly between distinct transformations. 

^†Number of red colonies divided by the total number of colonies: average of the three trials ± SD.