Table 3.

Historical Negative and Positive Control Values for Reverse Mutation Assay, 2014.

						Activation
Strain	Control	None					Rat Liver
		Mean	SD	Min	Max	95% CLa	Mean	SD	Min	Max	95% CL*
TA98	Neg	16	5	5	42	6–26	24	7	5	53	10–38
	Pos	232	258	57	2691		400	165	109	1382
TA100	Neg	94	14	66	152	66–122	102	18	63	164	66–138
	Pos	681	176	213	1767		681	259	186	2793
TA1535	Neg	11	4	2	31	3–19	13	5	2	36	3–23
	Pos	586	226	16	2509		117	99	23	1060
TA1537	Neg	7	3	1	19	1–13	9	4	1	23	1–17
	Pos	411	355	32	2921		72	52	10	562
WP2 uvrA	Neg	25	7	7	62	11–39	28	8	10	55	12–44
	Pos	376	123	99	1026		302	102	91	687

^a95% CL = mean ± 2 SD (but not less than zero).