Table 1.

Outcomes of the fertility tests for the four knockout mouse lines.

Gene symbol	Genotype	No. of males	No. of pups	No. of litters	Mating period	Average litter size ±SD
Wildtype	+/+	3	180	20	10 weeks	9.0 ± 2.7
Prss44	−3293/−3293	3	219	27	15 weeks	8.1 ± 2.7
Prss46	−11 542/−11 542	3	128	16	9 weeks	7.8 ± 3.4
Prss54	−16/−16	4	128	17	8 weeks	7.1 ± 2.3