The placental membranes, which surround the fetus in utero, are made of chorioamnion (CA) — a composite bilayered structure made of amnion and chorion. The CA is the only tissue in the body designed to fail, yet early CA failure causes preterm birth and is associated with elevated infant morbidity and mortality 1. While the elastic moduli, E, of the chorion and the amnion have been independently investigated 1,2,3, how these two layers work together in the composite CA bilayer has yet to be thoroughly investigated.

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