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	©
Sketch of the three germ layers found in a vertebrate embryo.

(genetic biology)

Grammar: noun phrase
plural: germ layers
Definition: a layer of tissue within the early stage of a developing embryo
Example:
1. The developing embryo has three primary germ layers: the endoderm, the mesoderm, and the ectoderm.

2. After the formation of the blastula, cells migrate into the internal fluid-filled cavity of the blastula to form the germ layers.