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germ layer
(embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
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ectoblast, ectoderm, exoderm
the outer germ layer that develops into skin and nervous tissue
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mesoblast, mesoderm
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
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endoblast, endoderm, entoblast, entoderm, hypoblast
the inner germ layer that develops into the lining of the digestive and respiratory systems
