For humans, the gestation period can last forty weeks. There are cramps, morning sickness, strange food cravings, increasing discomfort, and a multitude of other effects. And the nine months of ...

University of Cambridge scientists say they have identified a key pathway that controls the expansion of the placental vascular tree in late gestation, demonstrating that fetus-derived signals are ...

Which group of mammals has the more 'primitive' reproductive strategy -- marsupials, with their short gestation periods, or humans and other placental mammals, which have long gestation periods? For ...