The Blastocyst reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Blastocyst

A blastocyst is an embryo at a stage where it consists of 30-150 cellss. It is covered in a layer of trophoblasts, cells which will eventually form the placenta. The inner cells of the blastocyst are undifferentiated, and a source of embryonic stem cells.

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