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In a bid to sidestep the ethical debate over the use of human embryos in medical research, scientists have developed a way to derive viable stem cell lines without harming the embryo.
They did so by extracting a single cell from the embryo — as in vitro fertilization clinics do when they test for genetic defects and introducing a common molecule called laminin to keep it in a stem cell, or pluripotent, state.
Subsequent development ...
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