brokenergy

The placenta? Yeah, considering that it is the only area that it is not differentiated unlike other areas of the body it can be used for stem cell research. It's harder to convert something back to it's earlier form than. The reason why some scientist want to use use zygotes or the fertilised egg is because unlike an adult stem cell, the zygote doesn't start differentiating into different cells after 6-7 days of fertilised. This allows scientists to toy with the cells to make spec...

specific tissue. The most at the moment is to make organs or limbs for people who need them, whether it would be used as a therapy drug is uncertain. The biggest concern is that would a stem cell cause a cell to go mutate to cause cancer. That and targeted treatment.

*It's a harder to convert something back to it's earlier form than use something that can be created potentially infinity, not that you can't turn a differentiated back to a multi or pluripotent cell (a cell that can turn into many different cells).