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[mass noun] The innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.
- ‘At a tissue level, an adult hydra is essentially a tube composed of two tissue layers, the ectoderm and the endoderm, which extend throughout the animal.’
- ‘In this tissue, therefore, the fate of some of the cells has been changed from prospective gut endoderm to mesoderm and ectoderm.’
- ‘In addition, they act as messengers, bearing molecular orders to the mesoderm and endoderm which they contact on arrival.’
- ‘These cells, usually seen as being mesodermal, apparently represent another cell line originating from endoderm.’
- ‘Other asymmetric anatomical features - such as placement of the heart and liver - are products of different layers, the mesoderm and endoderm.’
Mid 19th century: from endo- ‘within’ + Greek derma skin.
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