The germinal disc or area of a developing embryo that will form the main body of the organism.
From 'blast-' (germ, bud) + 'plate' (flat structure). Used in embryology to describe the disk-shaped area in eggs where the embryo actually forms.
In chicken eggs, the blastplate is the tiny white spot on the yolk where the actual chick develops—everything else is just food storage. That little dot becomes a whole bird!
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