A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The types of germ layers are the endoderm, ectoderm, and mesoderm.
hog:0000152 embryonic mesodermhog:0000153 embryonic ectodermhog:0000154 embryonic endodermhog:0001222 primitive endodermBFO:0000050 part of
hog:0000671
tao:0001122