Gastrulation, the process where an embryo reorganizes itself from a hollow sphere into a multilayered structure, is considered a 'black box' of human development. This is because human embryos are ...

In a longitudinal study published in Scientific Reports, researchers investigate the effect of maternal physical activity on the size and growth of the yolk sac during early pregnancy. To this end, ...

Scientists have been able to create stem cells that can mimic the early stages of mouse development. The researchers used only reprogrammed stem cells, not a fertilized egg, to create a synthetic ...

HeX-Embryoid model showing early blood cells (green) that have formed inside of blood vessels (red) surrounded by yolk sac mesoderm cells (blue) that support these tissues. University of Pittsburgh ...

Epidemiology and Infection, Vol. 103, No. 3 (Dec., 1989), pp. 577-585 (9 pages) Graded doses of live and heat-killed cells of Campylobacter jejuni were injected into the yolk-sac of 5-day-old chick ...

Isolated from its mother's body, a chicken embryo's only source of food is a golden-yellow dollop of nutrients known simply as yolk. Sustained by the placenta, mammals like ourselves have no need for ...

Cellular aggregates derived from human stem cells in previous studies could not be considered genuinely accurate human embryo models, because they lacked nearly all the defining hallmarks of a ...

Scientists have grown a scalable new embryo-like model that unshrouds some mysteries of early human development, including blood cell formation, or hematopoiesis—a first for the field. In an article ...

Do synthetic mice dream of electric sheep? We’re on the way to finding out thanks to a breakthrough in stem cell research. It’s not going to overthrow mankind from a lab anytime soon, but a stell cell ...

These colorful embryonic squid are all feeding off yolk sacs within their eggs. Squid develop directly, which means that the embryos have the same basic body plan as an adult squid. Get a closer view ...

During embryonic stem cell (ESC) development, pluripotent stem cells transition from a naïve state into a primed state before they take their first steps toward a lineage commitment. Jacob Hanna, a ...

Researchers have developed a new embryo-like model derived from adult cells that replicates key features of early human development, including the generation of blood cells. University of Pittsburgh ...