http://lifewithoutfaith.com/index.php?/archives/11-The-Stem-Cell-Battle-Continues….html From the page: “A blastocyst is a three day old embryo. It only contains about 150 cells. This is much less than the skin cells you destroy every time you scratch an itch. It contains no circulatory system, no nervous systems, no respiratory system, no heart, and no brain.”