The heart initially forms in a cephalic location and as it descends into the thorax, its connection through the ventral aortic sac with the paired dorsal aorta undergoes multiple changes that produce ...

H Spemann, H Mangold, (1924) Induction of embryonic primordial by implantation of organizers from a different species. Roux Arch Entw Mech 100:599–638. [Reprinted and translated in De Robertis EM, ...

Tiny ridges form in the throat during the fourth or fifth week of human embryonic development. If we were fish, these structures would develop into actual gills. However, in humans, these arches ...

These observations suggest that the genetic programs responsible for embryonic development were already present before the emergence of animal life, or that C. perkinsii evolved independently to ...

The collapse of Double Arch, one of Utah's majestic geologic arches, stunned park visitors and deprived the state of a popular natural landmark forever. But geologists say its demise was inevitable.

The asymmetrical arrangement of the arch arteries found in postnatal life requires major remodelling of the symmetrical embryonic precursor blood vessels called the pharyngeal arch arteries. These ...

REHOVOT, Israel, Sept 7 (Reuters) - Scientists in Israel have created a model of a human embryo from stem cells in the laboratory, without using sperm, eggs or a womb, offering a unique glimpse ...

In a scientific breakthrough that raises a number of medical and ethical issues, researchers have used stem cells to create living, growing models of a human embryo. Because stem cells were used ...

By this account, capturing the embryonic stem cell was the easy part. It’s coaxing them to produce specialized cells—the kind with specific functions needed to treat disease—that’s been so ...

These entities are human embryo models — masses of cells created from stem cells that mimic some properties of certain stages of embryo development. The achievement gives researchers a chance to ...