From early fetal tissue research to the first successful human treatments, this timeline documents the progress in stem cell science, and the policies that have impeded or promoted it. The stories of research involving human embryonic stem cells and the policy governing that work are intertwined and stretch back into the mid-1970s. Shortly after the Supreme Court ruling in Roe v. Wade, discussions began about how to conduct ethical research on human fetal tissue. Since that time, scientists have made great strides—most notable the isolation of human embryonic stem cells.
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