varajases arengujärgus embrüo (inimesel 3-4 päeva pärast viljastumist), mis tekib viljastatud munarakust rakkude jagunemise teel ning ei oma, erinevalt blastotsüstist, sisemist õõnsust
Early stage embryo (3–4 days post fertilization in humans), a 16-cell mass in a spherical shape that, unlike a blastocyst, does not have a cavity.
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