Germinal disc
Germinal disc may refer to:
In birds
The germinal disc, also called the blastodisc, is a small, circular, white spot (approximately 1.5-3 mm across) on the surface of the yellow yolk of a bird's egg.
In mammals
The blastodisc is a round single-cell layer of cells inside the blastula from which the embryo is going to form.
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