First they thought only Embryo cells would work.
Then they found stem cells from embryos could be changed into new cells.
Then they found stem cells from umbilical cords and fetal blood would work.
Then they found adult stem cells from other organs would work.
Then they found how to make adult stem cells act like embryonic stem cells.
The latest?
Just reprograming adult cells to change:
Illustration from Nature via AP
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