MACROMERE

"The macromere divides by a perpendicular wall into a larger and a smaller daughter-cell, the former of which often undergoes further division."

"In some cases, the macromere undergoes immediate division after reaching its destination in the embryo."

"The macromere also acts as the primary organizer of the body axis in some organisms."

"During embryonic development, the macromere gives rise to various cell types."

"The macromere is responsible for the initial formation of the germ layers."