Figure 1.

Human male fetal umbilical cord serum INSL3 concentrations during gestational weeks 15–20. Each data point represents the means ± SEM for all samples tested at that age. At gestational weeks 15, 16, 17, 19, and 20, there were 1, 3, 1, 3, and 4 fetal serum samples, respectively. No fetal cord blood was collected for age 18 weeks. All feti were assayed in duplicate or triplicate when possible. Fetus #9, 10, and 11 did not undergo repeat measure due to insufficient serum volume for repeat testing.