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	©
Cross-sectional animation of the early development of a sea urchin embryo, where yellow = ectoderm, orange = endoderm, red = primary mesenchyme cells and skeleton, and orange "dots" = secondary mesenchyme cells.

(genetic biology)

Grammar: noun
plural: endoderms
Definition: the innermost germ layer of an animal embryo

Compare ectoderm.
Example:
Simple change in the alignment of actin microfilaments in a few cells of the blastula leads to the formation of the gut, endoderm and ectoderm.