Known as gastrulation, this crucial process unfolds in the third week of human development. "Gastrulation is the origin of our own individualization, the emergence of our axis," says Rockefeller's ...

Gastrulation is a process common to nearly all metazoan organisms during which an embryo with distinct tissue layers develops out of a seemingly unstructured assembly of cells referred to as ...

This internal left-right asymmetry is believed to begin at the very early stage of development -- when a tiny embryo is divided into two parts during a process called gastrulation. This process ...