The moral value of human life develops gradually.
I took this thought out of a report that I am attempting to write about stem cells, and I needed to put it someplace. My belief is that a human embro is nothing more than a few cells and that medical researchers should do what they want with them as long as the public remains informed. I mean, god bless you for being smart enough to tell me what an embryonic stem cell is, go forward with what you are doing and godspeed.
At Duke university they began treating a child having Sanfilippo Syndrome, a very rare disease for which there were no prior treatments. The treatment involved a transfusion of stem cells derived from donated umbilical cord blood. The researchers don't understand exactly how the umbilical stem cells know how to get into the bone marrow and start repairing the immune system, but that's exactly what they appear to do. It's not unlike mixing potions.