How does a tiny cluster of cells become an embryo with a head, trunk, and tail? And how do thousands of genes coordinate this development? A new imaging method makes it possible to visualize the ...

Lab-grown structures with the potential to develop into fetuses should be defined — and regulated — as embryos, some researchers say. It is time for a redefinition of the human embryo, a team of ...

The schematic depicts five stages of human implantation: (1) blastocyst differentiation into ICM/TE; (2) apposition and adhesion to luminal epithelium (dependent on L-selectin/ligand); (3) invasion ...