Multicellularity is one of the most profound phenomena in biology, and relies on the ability of a single cell to reorganize itself into a complex organism. It underpins the diversity in the animal ...

Scientists are seeking “the organizer” — the embryonic process that sifts and shapes the development of new cells, ultimately shaping them into fully-formed humans. It’s been a difficult process.

Because ES cells maintain the ability to undergo differentiation to all cell lineages, they can provide a universal cell source for the study of the cell biology of embryogenesis. Because ES cells ...