Heavens, this word is frightening. It sounds like something that grows inside you and then explodes, with fatal consequences.
illustration: Togo Picture Gallery, Database Center for Life Science
The fact that a blastocyst is actually a tiny sphere of cells that's one of the very earliest stages in the development of a baby might even make it worse.
Sunday Rest: blastocyst. The blasto- bit comes from the Greek blastos, which means bud. Cyst comes from the Greek word kustis, which means pouch or bladder.
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