Table 2.

P4 Levels Measured on the Fourth Day After Female Mice From the Groups Were Mated to WT Males

Hormone	WT, SO (n = 9)	WT, Untreated (n = 6)	Kiss1−/− E2/Gonadotropin-Primed/SO (n = 6)	Kiss1−/− Untreated (n = 4)	Kiss1−/− E2/Gonadotropin-Primed/SO+P4 (Day 3) +E2 (Day 4) (n = 5)
P4, ng/mL	109.0 ± 23.7	43.5 ± 10.1	44.3 ± 10.3	7.1 ± 0.6	83.1 ± 7.9

Abbreviation: SO, superovulated. Groups are as follows: 1) SO WT females; 2) untreated WT females; 3) E2/gonadotropin-primed SO Kiss1^−/− females; 4) untreated Kiss1^−/− females; and 5) E2/gonadotropin-primed SO Kiss1^−/− females that received a P4 injection (sc) (1 mg/100 μL) on the third day after mating followed by an E2 injection (sc) (20 ng/100 μL) on the morning of day 4. Data are shown as mean ± SEM.