Table 1.

LacZ mutant frequencies in spleens of RcsX tumor-bearing and control mice

Treatment	Animal code	No. of colonies (×105)	No. of mutants	Mutant frequency (×10−5)
Control	303	5.60	67	12.0
	305	1.28	7	5.5
	306	1.68	6	3.6
	307	6.00	54	9.0
	301	5.12	50	9.8
	304	2.62	20	7.6
	309	2.16	16	7.4
	310	9.80	70	7.1
				7.7 ± 2.6
RcsX	103	8.80	139	15.8
	105	4.04	65	16.1
	106	2.72	25	9.2
	111	1.92	25	13.0
	104	3.56	43	12.1
	109	3.68	69	18.8
	101	4.86	123	25.3
	112	3.56	60	16.9
				15.9 ± 4.9
RcsX + NMA	203	8.52	99	11.6
	207	10.56	106	10.0
	206	2.48	18	7.3
	204	12.08	84	6.9
	201	9.40	100	10.6
	208	6.48	82	12.7
	205	3.60	52	14.4
	210	6.72	66	9.8
				10.4 ± 2.5
Control + NMA	406	7.96	64	8.0
	402	9.52	74	7.8
	401	2.40	13	5.4
	404	5.32	37	6.9
	403	4.08	36	8.8
	405	3.24	25	7.7
	407	2.16	24	11.1
	409	1.70	25	14.8
				8.8 ± 2.9