TABLE 2.

Effect of the uvr operon of Tn5252 on UV-induced mutagenesis

Strain	UV dose (J/m2)	% Survival	No. of cells per 108 survivors carrying the indicated mutationa
			Fusr	Optr	His+
S. pneumoniae
SP1311	0	100	0	0
	10	0.152	50	0
	25	0.00059	40	40
SP1317	0	100	20	30
	10	11.56	310	4,420
	25	3.4	6,220	113,000
E. coli
AB1157	0	100			0
	5	72			18
	10	48			52
	25	15.5			189
RM1140	0	100			0
	5	3			0
	10	0.55			0
	25	0.2			0
RM1140(pSE117)	0	100			0
	5	80			40
	10	52			187
	25	18.5			310
RM1140(pKM101)	0	100			0
	5	92			302
	10	62			706
	25	21			880
RM1140(pSJ142)	0	100			0
	5	87			160
	10	60			264
	25	29			950
RM1140(pAT29)	0	100			0
	5	5.1			0
	10	0.47			0
	25	0.17			0

^aFus^r, resistance to fusidic acid; Opt^r, resistance to optochin; His⁺, histidine prototrophic revertants.