Quote from TA;551736:
I might not care if it actually did anything useful (like use their stem cells for research/cures, etc), but this is just stupid.
I just want to mention so that nobody's confused, we don't actually get embryonic stem cells from embryos. What we get them from is the morula. At ~5 days something is formed called a blastocyst, and that inner cell mass is what contains the embryonic stem cells.
They're not in tissue, they're actually in the beginning before any tissue forms.
The reason we want embryonic stem cells though, is that they're pluripotent (can form any kind of cells), unlike adult stem cells that are multipotent (can only form specific cells, for example a mammary stem cell only forms mammary cells and so on).
Anyways, I just figured I should probably clear that up so someone doesn't get the wrong idea...
:awesome:
[SPOILER="Spoiler"]While I'm on the topic, I figure I should mention that cancers are tissue specific stem cells that keep hearing the message self renew and not differentiate...[/SPOILER]