As development continues, the epiblast invades inward toward the primitive endoderm. This begins the differentiation into the three germ layers that will construct all other bodily tissues: ectoderm, ...

A study published today (September 11) in Nature Ecology & Evolution suggests that instead of two distinct germ layers, cnidarians may indeed have three. The authors show that the mesendoderm of the ...

Pluripotent stem cells are cells that have the capacity to self-renew by dividing and to develop into the three primary germ cell layers of the early embryo and therefore into all cells of the ...