Fig. 2

Plasma concentrations of relaxin and serelaxin. Plasma levels of relaxin + serelaxin (mean ± SEM), measured at baseline (0) and at 6, 12, and 24 h from the start of study drug administration in primiparous women ≥40 weeks of pregnancy in the pooled placebo and pooled MTD serelaxin groups. In the placebo group, only endogenous relaxin-2 is measured, while in the pooled MTD group, both serelaxin and endogenous relaxin-2 are detected