The layer of cells in early embryonic development, particularly the germinal disc or the entire cellular layer of a blastula.
From Greek 'blastos' (bud, germ) + 'derma' (skin, layer). Describes the outermost or primary tissue layer of the developing embryo.
The blastoderm is where everything starts—all your tissues eventually come from this simple sheet of cells, making it one of biology's greatest transformations!
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