Table 1.

Mutant frequency at the C3H/HeN allele of the Ms6hm locus in F₁ mice

Male				Female		F1 No.	C3H allele mutant*
Strain	No.	Dose, Gy	Stage	Strain	No.		No. (%)	P value
C3H	23	0		C57BL	35	226	19 (8.4)
	10	6	Spermatozoa		14	63	14 (22)	0.0022
	7	6	Spermatogonia		10	69	13 (19)	0.014
C57BL	27	0		C3H	28	203	20 (9.8)
	21	6	Spermatozoa		28	117	23 (20)	0.013
	6	6	Spermatogonia		11	61	5 (8.2)	0.698

^*Mutants of this table were scored by the 60-bp criterion.