The fluid-filled cavity within a blastula during early embryonic development; the space between the cells of the developing embryo.
From Greek 'blastos' (bud, embryo) + 'koelos' (hollow, cavity). The standard spelling in modern developmental biology.
This cavity is crucial—it's where the embryo starts folding and reshaping itself, and without it, the entire process of becoming a complex organism wouldn't work!
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