Table 3 Characteristics of relaxin secretion in non-pregnant and pregnant cycles of humans and selected non-human primate species.
From: Biology of primate relaxin: A paracrine signal in early pregnancy?
Species | Days to peak serum relaxin concentrations (Ovulation = D0) | Peak serum relaxin concentrations (ng/ml) | Normal term gestation (Days) | Reference |
|---|---|---|---|---|
Human | Â | Â | Â | Â |
Non-pregnant cycle | 10 | 0.06 | Â | [200] |
Pregnant cycle | 56–77 | 1.0–3.5 | 280 | [201] |
Chimpanzee | Â | Â | Â | Â |
Non-pregnant cycle | 8–13 | 0.15–1.40 |  | [202] |
Pregnant cycle | 30 | 2.0 | 230 | [202] |
Baboon | Â | Â | Â | Â |
Non-pregnant cycle | 12 | 0.45 | Â | [48] |
Pregnant cycle | 25–35 | 1.0–1.5 | 177 | [203] |
Rhesus macaque | Â | Â | Â | Â |
Non-pregnant cycle | 13 | 0.05 | Â | [204] |
Pregnant cycle | 45–60 | 1.0–1.5 | 165 | [43] |
Cynomolgus macaque | Â | Â | Â | Â |
Non-pregnant cycle | 16 | 0.03 | Â | [43] |
Pregnant cycle | 45–60 | 1.0–1.5 | 165 | [43] |
Common marmoset | Â | Â | Â | Â |
Non-pregnant cycle | 10–11 | 1.0–2.5 |  | [205] |
Pregnant cycle | 84–98 | 12.0–16.0 | 155 | [51] |