In embryology, cells or tissues formed on the outside or periphery of an embryo, as opposed to inner tissues.
From Greek 'apo-' (away from, outer) + 'blast' (germ layer, bud). An embryological term describing outer cell formation.
The apoblast distinction helps embryologists track which cells form outer structures like skin, as opposed to inner organs—a blueprint laid down in your first weeks of existence.
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