In the mammal, primitive hematopoiesis is first derived from mesodermal cells within a region out of the embryonic sculture known as the yolk sac. Within this region, primitive red cells and ...

Moreover, the yolk sac also plays a role in overall developmental processes such as protein synthesis, gastrointestinal tract formation, stem cell production, and hematopoiesis.

*12 Definitive hematopoiesis: During the fetal period, hematopoiesis begins in the yolk sac with primary hematopoiesis and then secondary hematopoiesis occurs in the AGM region.

Hematopoiesis is the process by which the body produces blood cells and blood plasma. It occurs in the bone marrow, spleen, ... At this stage in development, the yolk sac, ...

Unlike other embryo models, the structures also contained functional blood islands, or sites on the yolk sac where hematopoiesis takes place. Starting 16 days after the iPSCs were cultured, ...

The yolk sac of the embryo produces two partially overlapping waves of hematopoiesis. The first (primitive) wave gives rise to hematopoietic cells that last only during embryonic development.

This article describes the pathways involved in hematopoiesis; ... Primitive erythroid cells can be found in the yolk sac between weeks 2 and 8 of gestation.

The constant production of short-lived blood cells, needed for proper oxygenation of tissues and protection against pathogens throughout life, relies on a small cohort of HSCs. The first HSCs ...

These MoMg adopt the morphology and gene expression profiles characteristic of microglia despite their monocytic origin, including the expression of Sall1. However, unlike yolk sac-derived embryonic ...