A study of a simple marine animal suggests that the common ancestor of cnidarians and bilaterians may have had three germ layers instead of two. Nematostella embryos’ two cell layers arise during ...

Further cell divisions lead to the formation of the primitive endoderm ... they saw that these aggregates elongate, mimicking gastrulation, and cells begin to differentiate into those representing all ...

Menthol from vaping during pregnancy may activate stress channels in embryos, disrupting development and increasing birth ...