New views of early embryo development reveal differences between humans and mice.

Clusters of cells Embryo models are clusters of embryonic stem cells (ESCs) that can begin to differentiate and organize themselves in ways that resemble the development of an early embryo.

Scientists very rarely get access to most sharks, the development of their young or the nursery grounds where they grow. So seeing a hammerhead shark (Sphyrna tiburo) embryo, halfway through its ...