Table 1.

Sperm count and fertility.

Genotype	Cell Count (1 × 10 −6/mL)	Male Fertility	Litter Size
WT	5.73 ± 0.79	6/6	8.5 ± 0.9
KO	0.01 ± 0.003 *	0/6	0

To test fertility, sexually mature WT and KO males were bred to WT females. * Significantly different vs. WT, p < 0.05.