http://en.wikipedia.org/wiki/Blastocyst - The Blastocyst is the structure formed in early mammalian embryogenesis, after the formation of the blastocele, but before implantation. It possesses an inner cell mass, or embryoblast, and an outer cell mass, or trophoblast.
http://www.isscr.org/glossary/index.htm - Blastocyst
A very early embryo consisting of approximately 150 cells. The blastocyst is a spherical cell mass produced by cleavage of the zygote (fertilized egg). It contains a fluid-filled cavity, a cluster of cells called the inner cell mass (from which embryonic stem cells are derived) and an outer layer of cells called the trophoblast (that forms the placenta).
This is an interesting link... http://www.advancedfertility.com/blastocy.htm
So I gather by my quick search is that blastocysts are fertilized human embryos which if inserted into a woman would grow to be a human. So then the ethical question is, "when does life start?".
Man is entering a period of discovery that will unlock the Creator's design for life... my question is, will the Creator let him?
I will remind everyone NOT to make this personal. Do not attack or degrade anothers opinion on this subject, as volatile as it is. We can discuss this with respect. I'm looking forward to what our research finds.